Industrial Engineering & Management - Comprehensive Notes
Chapter 1: Industrial Engineering and Management
1.1 Concept of Industrial Engineering
Definition (AIIE):
· Concerned with design, improvement, and installation of integrated systems of:
· People
· Materials
· Equipment
· Energy
Key Focus:
· Engineering approach to analysis of resource use and cost
· Main resources: Men, Money, Materials, Equipment, Machinery
· Primary objective: Productivity Improvement
Productivity Improvement implies:
1. More efficient use of resources
2. Less waste per unit of input
3. Higher output for fixed input levels
1.2 History and Development
Industrial Revolution (1750):
· Textile industry inventions
· Steam engine development
· Advances in metal cutting and machine tools
Key Contributors:
Person Contribution
Adam Smith "Wealth of Nations" (1776) - Division of Labor
Charles Babbage "On Economy of Machinery" (1832) - Analytical Calculating Machine
Henry R. Towne Economic aspects of engineering
Frederick A. Halsey Halsey Premium Plan of wage payment
Henry L. Gantt Gantt Chart
Frederick W. Taylor Father of Scientific Management; Metal cutting research
Frank B. Gilbreth Motion study; Method study
Important Milestones:
· 1908: First IE departments at Penn State and Syracuse University
· 1933: First Ph.D. in IE awarded to Ralph M. Barnes (Cornell)
· 1940-1946: Development of:
· Predetermined Time Standards (MTM, Work-Factor)
· Value Engineering
· Systems Analysis
Post-WWII Developments:
1. Operations Research (O.R.)
2. Industrial Engineering and Computers
3. System Analysis and Design
4. Network Planning Techniques (PERT/CPM)
5. Value Engineering
6. Behavioural Science and Human Factors
1.3 Roles of Industrial Engineer
1. Advisor/Consultant - Data interpretation, review
2. Advocate/Activist - Promote processes
3. Analyst - Break down systems for insight
4. Boundary Spanner - Bridge IE and user information gaps
5. Motivator - Stimulate groups/individuals
6. Decision Maker - Select among alternatives
7. Designer/Planner - Produce solutions
8. Expert - Provide specialized knowledge
9. Coordinator and Integrator
10. Innovator/Inventor - Create advanced solutions
11. Measurer - Obtain data on existing conditions
12. Project Manager - Supervise/evaluate projects
13. Trainer/Educator - Teach IE skills
14. Data Gatherer
15. Negotiator
1.4 Applications of Industrial Engineering
Before 1940: Manufacturing industries
· Method improvement
· Work standards
· Production control
· Wage policies
After 1940: Expanded to
· Construction and transportation
· Farm and airline operations
· Public utilities
· Government and military operations
· Marketing, Finance, Purchasing, Industrial Relations
1.5 Production Management
Two Major Areas:
1. Design of Production System
· Product design
· Process design
· Plant and equipment design
· Job design
· Equipment selection and replacement
· Labor skills and training
· Input materials selection
· Plant selection and layout
2. Control Systems Development
· Inventory control policies
· Quality control policies
· Production-schedule control policies
· Productivity and cost control policies
· Constructing control systems
Strategic vs Tactical Decisions:
· Strategic: Major investments in system design
· Tactical: Methods and instruments of implementation
Production Management Cycle:
· Operations connected through:
· Implementation
· Control
· Evaluation
1.6 Production Management vs Industrial Engineering
Aspect Production Management Industrial Engineering
Focus Concepts and techniques for managing production Analysis, design, and control of productive systems
Scope Directing human efforts Designing systems
Analogy Aircraft pilot training Aircraft design
1.7 Operations Management
Definition:
· Evolved from production/manufacturing management
· Concerned with management of producing function in ANY organization
· Involves:
· Designing systems that produce goods/services
· Planning and controlling day-to-day operations
Operating System:
· Processes and activities to transform inputs into goods/services
· Components: People, Material, Facilities, Information
· End result: Adding value through enhancing/rearranging inputs
1.8 Management Science (MS)
Definition:
"A problem-solving process used by an interdisciplinary team to develop mathematical models that represent simple-to-complex functional relationships and provide management with a basis for decision-making."
Four Major Characteristics:
1. Systems Overview - Examine functional relationships from total system perspective
2. Interdisciplinary Approach - Look at problems from different angles:
· Mathematician → Mathematical relationships
· Chemical engineer → Flow theory
· Cost accountant → Component costs
3. Uncovering New Problems - Solutions reveal new issues
4. Modeling-Process Approach - Systematic problem solving using mathematical models
Additional Characteristics:
5. Primary focus on managerial decision-making
6. Application of science to decision-making
7. Dependence on electronic computers
8. Appraisal based on economic effectiveness
1.9 Tools of Management Science
Tool Application
Decision Matrices Allocation/investment with few possible solutions
Decision Trees Multiple decision periods
Mathematical Programming Maximize goals subject to constraints
Branch and Bound Very large/infinite alternatives
Network Models Planning/controlling complex projects (PERT/CPM)
Dynamic Programming Sequential decisions
Markov Chains Predicting outcomes of changing conditions
Game Theory Competitive environments
Inventory Models Minimize ordering/carrying costs
Queuing Models Service system performance
Simulation Models Complex systems analysis
Five Types of Simulation Models:
1. Artificial Intelligence
2. Heuristic Programming
3. Management Games
4. Systems Simulation
5. Monte Carlo Simulation
1.10 Managerial Economics
Definition:
Management's application of economic principles in the decision-making process.
Four Economic Principles:
1. Incremental Principle: Decision sound if it increases revenue more than costs
2. Time Perspective: Consider both short-run and long-run effects
3. Opportunity Cost Principle: Measure sacrifices required by alternatives
4. Discounting Principle: Discount future costs/revenues to present values
Demand Analysis:
· Price Elasticity of Demand:
E = \frac{Q_2 - Q_1}{Q_2 + Q_1} \div \frac{P_2 - P_1}{P_2 + P_1}
Where:
· Q₁, Q₂ = quantities before and after price change
· P₁, P₂ = corresponding prices
Forces Determining Demand:
1. Customer desires
2. Customer income
3. Prices of substitutes
4. Market characteristics
1.11 Managerial Accounting
Four Functions:
1. Planning
· Business budgets as principal financial means
· Sales budget is starting point
· Production budget based on sales budget
2. Control
· Comparison of actual with predetermined criteria
· Techniques:
· Standard Costs: Predetermined from past experience, motion study, time study
· Responsibility Accounting: Costs identified with responsible individuals
3. Deciding
· Programmed analysis: Routinized collection of relevant data
· Non-programmed analysis: Special cost information for specific decisions
· Core concept: Incremental concept - analysis of changes in total costs and revenues
4. Analysis of Past Performance
· Comparisons of two or more periods
· Comparison within one period
· Source and application of funds analysis
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Chapter 2: Production and Productivity
2.1 Production
Definition:
· Any process developed to transform input elements into specified output elements
· Inputs: Men, Materials, Capital, Information, Energy
· Outputs: Finished products and services
Four Factors of Production:
1. Nature (Land and natural resources)
2. Labour (Human efforts)
3. Capital (Buildings, machinery, tools, raw materials)
4. Enterprise (Organization of factors)
2.2 Production Function
Definition:
Establishes relationship between quantity of output and quantities of different inputs.
y = f(c_1, c_2, c_3, \dots, c_n)
Where 'y' output depends on quantities c₁, c₂, c₃...cₙ of inputs.
Evolution:
· Industrial Revolution → New machinery
· Mechanization era began
· 1880 onwards: Management techniques advancements (Taylor)
· Automation evolution:
1. Detroit Automation
2. Feed Back Control
3. Computer Technology
2.3 Production System
Concept:
· Part of larger system - the business firm
· Difference between input value and output value = Value created
Simplified Production System:
· Inputs → Operations/Processes → Storage → Inspections → Outputs
Analysis of Production Systems - Comparison Table:
Factor Jobbing Batch Mass Process
Equipment Standard machinery Similar + some special purpose Specialized machinery Completely integrated
Layout Process/functional layout Process layout + family groupings Line layout Designed for specified flow
Flow Intermittent Intermittent Continuous Continuous
Cost/Product High Medium Small Very small
Work-in-Progress High Medium Small Theoretically none
Examples Ship building, Civil Engineering Machine tools, Furniture Cigarettes, TVs Chemicals, Oil, Petrol
2.4 Input-Output Model
Components:
1. Inputs - Resources entering the system
2. Process - Transformation activities
3. Outputs - Results of transformation
Key Concept:
· Efficiency of engineering system: Output/Input = 1 (ideal)
· Economic system: Efficiency must be > 1 (profit state)
2.5 Micro-Economics Applied to Plants
Economics Divisions:
1. Macro-economics: Whole economy - national income, government spending
2. Micro-economics: Individual units - customers, plants
Approaches:
1. Positive: Description and theory of operation
2. Normative: What to do and how to do it
Decision Goals:
1. Inventory goal: Optimum inventory balancing stock-out vs holding costs
2. Production goal: Output level, low costs, stable workforce
3. Market goal: Sales strategy and market share
4. Profit goal: Maximizing profits (measure of performance)
Business Decision Problems:
1. Resource Allocation: Loading, routing, scheduling
2. Queuing Problems: Additional equipment decisions
3. Inventory Problems: Optimum stock levels
4. Pricing Problems: Selling price decisions
5. Investment Problems: New plant building and machinery
2.6 Productivity
Definition:
\text{Productivity} = \frac{\text{Output}}{\text{Input}}
Example Calculation:
· Workers = 10, Items produced/unit time = 200
· Productivity = 200/10 = 20 items per worker
Purpose to Increase Productivity:
· Management: Good earnings, clear debts, sell more, market position
· Workers: Higher wages, better conditions, higher living standard, job security
· Customers: Reduced prices
2.7 Factors Affecting Productivity
A. National Productivity Factors:
1. Human Resources
2. Technology and Capital Investment
3. Government Regulation
B. Manufacturing/Service Productivity Factors:
1. Product or System Design
2. Machinery and Equipment
3. Skill and Effectiveness of Worker
4. Production Volume
2.8 Increasing Productivity of Resources
1. Material:
· Reduce scrap
· Design changes for material savings
· Correct processes
· Proper training
· Suitable material handling and storage
2. Labour:
· Design changes for easier assembly
· Workstudy techniques for method improvement
3. Plant, Equipment, Machinery:
· Improved tools and attachments
· Reduced set-up times
· Proper maintenance
4. Land and Buildings:
· Suitable plant layout
· Proper orientation and conditions
2.9 Kinds of Productivity Measures
Measure Resource Input
Labour Productivity Labor hours
Direct Labour Cost Productivity Direct labor costs
Capital Productivity Depreciation charges or book value
Direct Cost Productivity All direct cost items
Energy Productivity Energy consumed
Raw Material Productivity Raw material consumed
Sources of Information:
1. Product Identification Information
2. Accounting Information
3. Work Measurement Information
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Chapter 3: Organisation
3.1 Concept of Organisation
Definition:
"Process of identifying and grouping work, defining and delegating responsibility and authority, and establishing relationships for enabling people to work most effectively together."
Purposes:
1. Establishes pattern of relationship with duties/responsibility
2. Demarcates authority, responsibility, duties
3. Provides adequate communication
4. Coordinates and controls activities
3.2 Importance of Organisation
A. Carnegie quote: "Take away our factories, trade, transportation, money - leave nothing but our organisation, and in four years we shall have re-established ourselves."
Benefits:
1. Facilitates Administration
2. Facilitates growth and diversification
3. Stimulates creativity
4. Optimum use of resources
5. Leads to specialization
6. Minimizes corruption and inefficiencies
7. Facilitates training and managerial development
3.3 Characteristics of Organisation
1. Group of people (small or large)
2. Works under executive leadership
3. Tool of management
4. Division of work and responsibilities
5. Defines/fixes duties and responsibilities
6. Establishes authority-responsibility relationship
7. Step toward achievement of goals
3.4 Elements of Organisation
1. Well defined objectives
2. Well organized and coordinated group
3. Proper division of work and labour
4. Clear policies and procedures
5. Proper division of Authority and Responsibility
6. Effective communication system
3.5 Process of Organisation
1. Determination of objectives - Purpose and nature of work
2. Deciding various activities - Divide into functions/sub-functions
3. Grouping of activities - Departments/sections based on similarity
4. Assignment of responsibilities - Specific job assignments
5. Delegation of Authority - Corresponding to responsibility
6. Providing physical facilities - Machinery, tools, environment
3.6 Organisation Theory
Definition:
Study of structure, functioning, performance of organisations AND behaviour of groups and individuals.
Three Categories:
3.6.1 Classical Organisation Theory
Key Pillars:
1. Division of Labour - Narrow tasks for specialization
2. Scalar and Functional Processes - Vertical and horizontal growth
3. Structure - Framework of formal relationships
4. Span of Control - Number of subordinates a manager can supervise
Criticisms:
· Based on experience, not research
· Unrealistic assumptions (closed system, static view)
· Neglects human factor
· Bureaucratic behaviour emphasis
· Little scope for integration
3.6.2 Neo-Classical Organisation Theory
Key Differences from Classical:
Aspect Classical Neo-Classical
Structure Impersonal, mechanical Social system
Focus Work and economic needs Small groups, emotional/human qualities
Emphasis Order and rationality Personal, security, social needs
Behaviour Product of rules Product of feelings, sentiments, attitudes
Practices Authoritarian Democratic, employee involvement
Propositions:
1. Organisation is a social system
2. Social environments affect and are affected by people
3. Informal organisation exists alongside formal
4. Integration of organisational and individual goals
5. People are interdependent
6. Money is one of many motivators
7. Man's approach is not always rational
8. Two-way communication necessary
9. Teamwork essential for higher productivity
Criticisms:
· Certain assumptions not true
· Limited applicability
· Lacks unified approach
· Too much emphasis on human aspect
3.6.3 Modern Organisation Theory
Five Parts of System:
1. Individual - Varied backgrounds, attitudes, motives
2. Formal Organisation - Rules, regulations, procedures
3. Informal Organisation - Social ties, groups
4. Status and Roles - Pattern of actions expected
5. Physical Setting - Working conditions
Linking Processes:
1. Communication - Formal/informal, vertical/horizontal
2. Decision-making - Joint efforts of various parts
3. Balance - Equilibrating mechanism
Major Goals: Growth, Stability, Adaptability
Appraisal:
· Open system concept
· Dynamic interaction with structure
· Both macro and micro approach
· Multi-motivated individuals
· Multidisciplinary
· Systems approach (study as whole, not parts)
Criticisms:
· Hasn't lived up to expectations
· Not yet sufficient as theory of explanation in human behaviour
3.7 Principles of Organisation
1. Consideration of Objectives - Only necessary objectives
2. Relationship of Basic Components - Objectives determine work, which determines personnel and facilities
3. Responsibility and Authority - Must go together
4. Span of Control - Ideal range 4-8, varies 2-20
5. Dividing and Grouping Work - Departmentation, specialization
6. Effective Delegation - Pass down tasks with decisions
7. Communication - Two-way, linking process
8. Line and Staff Relationships - Primary vs supporting activities
9. Balance, Stability and Flexibility
Span of Control Factors:
1. Trained/experienced subordinates → Wider span
2. Specialized/same work → Wider span
3. Complex work → Small span
4. Manager's capacity
5. Efficient organization and communication → Wider span
6. Personal assistant → Wider span
7. Clear objectives, policies, plans → Wider span
3.8 Organisational Structure
Two Dimensions:
1. Horizontal - Basic departmentation
2. Vertical - Hierarchy of superiors/subordinates
Need for Organisation Structure:
1. Achieve specific goals
2. Fix responsibility
3. Establish authority
4. Achieve coordination
5. Promote division of work and specialization
6. Avoid confusion and duplication
7. Facilitate flow of information
8. Define positions and units
3.10 Organisation Chart
Definition:
Graphical portrayal of structural relationship among different functions and positions.
Shows:
1. Interrelationship and relative position of departments
2. Lines of command
3. Relationships between managers
4. Types of managerial relationships (line, staff, functional)
5. Names of managers and number of persons supervised
6. Illogical grouping of functions
7. Omission of particular functions
Advantages:
1. Quick identification of responsibility
2. Pinpoints weaknesses
3. Supplements organization manual
4. Training device and planning guide
5. Shows nature of organization
Limitations:
1. Needs frequent updating
2. Shows static picture
3. Induces rigidity and red tape
4. Difficult to portray human relationships
3.10.1 Organisation Manual
Definition:
Booklet detailing organization objectives, policies, authorities, functions, duties, responsibilities.
Contents:
1. Statement of Company objectives and policies
2. Glossary of terms
3. Organization procedures
4. Reporting organization changes
Types:
1. Policy manual - Policies and limitations
2. Operations manual - Methods, procedures, standards
3. Organisation manual - Duties and responsibilities
4. Rules and regulations manual - Operating rules, employment regulations
5. Departmental practice manual - Internal policies and procedures
Advantages:
· Enables quick learning of procedures
· Quick decision-making
Drawbacks:
· Costly and time-consuming to prepare
· Little scope for initiative and discretion
3.11 Types of Organisation (Formal)
3.11.1 Line, Military or Scalar Organisation
Characteristics:
· Simplest form
· Authority flows directly from top to bottom
· Based on relative authority and responsibility
Advantages:
1. Simple and easy to understand
2. Flexible
3. Clear division of authority
4. Clear communication channel
5. Speedy action
6. Strong discipline
7. Develops all-round executives
Disadvantages:
1. Neglects specialists
2. Overloads key executives
3. Requires high type of supervisory personnel
4. Limited to very small concerns
5. Encourages dictatorial style
6. No provisions for training and replacement
7. More wastage of materials and manhours
Applications:
· Small concerns
· Automatic/continuous process industries (paper, sugar, textile)
3.11.2 Functional Organisation (Taylor)
Eight Functional Foremen:
Shop Floor (4):
1. Gang Boss - Preparation of work
2. Speed Boss - Cutting tools, speeds, feeds
3. Repair Boss - Maintenance
4. Inspector - Quality
Office (4):
5. Route Clerk - Work orders and routing
6. Instruction Clerk - Specifications and instructions
7. Time and Cost Clerk - Time and wages records
8. Disciplinarian - Personal records, discipline
Advantages:
1. Better performance of duties
2. Expert advice to workers
3. Relieves line executives
4. Reduces accidents and wastage
5. Relieves pressure for all-round executives
6. Improved quality
Disadvantages:
1. Difficult coordination
2. Difficult discipline (8 bosses)
3. Difficult to fix responsibility
4. Worker confusion
5. Complex industrial relationships
6. No opportunity for worker initiative
7. All-round executives cannot be developed
Applications: Modified form used in advanced concerns
3.11.3 Line and Staff Organisation
Characteristics:
· Line executives retain supervisory authority
· Staff executives advise on specialized matters
· Final decision remains with line executive
Advantages:
1. Expert advice available
2. Line executives relieved of some load
3. Less wastage
4. Improved quality
5. No confusion like functional organisation
6. Advantages of both line and functional
Disadvantages:
1. Higher product cost (salaries)
2. Staff may infringe on line rights
3. Confusion if functions unclear
4. Frictions and jealousies
5. Line may lose initiative
Applications: Medium and larger enterprises
3.12 Committees
Definition:
Group of people who work collectively, discuss, decide, and recommend solutions.
Types:
1. Standing/Permanent Committee
2. Temporary Committee
3. Committee in Control
4. Coordination and Discussion Committee
5. Advisory Committee
6. Educational Committee
Advantages:
1. Two experts better than one
2. Coordinates departmental efforts
3. Valuable for broad policy determination
4. Reduces management workload
5. Good for innovation/brainstorming
6. Secures cooperation
7. Useful for appointments
8. Trains younger executives
Limitations:
1. Slow operation
2. Committees tend to hang on
3. May be used as rubber-stamp
4. No individual responsibility
5. Decisions often compromised
3.13 Project Organisation
Characteristics:
· Created for big projects
· Timelimited
· Directly oriented to product life cycle
· Specialist team from different departments
· Coordinated by Project Manager
Need when:
1. One-time task with well-defined specifications
2. Unique/unfamiliar challenge
3. Project completion critical
4. Project must be completed within time limit
Advantages:
1. Doesn't interfere with existing organization
2. Concentrated attention to complex project
3. Maximum use of specialists
Limitations:
1. Deal with varied nature persons
2. Attracts existing personnel
3. Experience not transferable
4. Job insecurity
5. Difficult decision-making
6. Conflicts among specialists
3.14 Matrix Organisation
Definition:
· Pure project structure superimposed on functional structure
· Project structure + Functional organization
· Horizontal lateral dimension + Traditional vertical orientation
Characteristics:
· Team members have two bosses (functional + project)
· Members return to departments after project
Advantages:
1. Focuses resources on single project
2. More flexible than traditional hierarchy
3. Better utilization of specialists
Limitations:
1. Violates unity of command
2. Complex organizational relationships
3. No line authority for project manager
4. Low morale due to heterogeneous group
Uses:
· Electronics, Aerospace, Chemicals, Banking, Industrial products, Insurance, Advertising, Hospitals
3.15 Informal Organisation
Definition:
Set of informal relationships through which employees fill personal needs.
Reasons for formation:
· Natural leaders
· Common interests
· Social activities
Advantages:
1. Quicker and more efficient work
2. Social acceptance and diversion
3. Labour problems minimized by recognizing natural leaders
Disadvantages:
1. Favouritism
2. Confidential information leakage
3. Rumours spread fast
3.17 Departmentation
Definition:
Breaking down an enterprise into various departments.
Aims:
1. Group activities/personnel into manageable units
2. Bring specialization
3. Fix responsibility for achieving goals
Methods:
1. By Function:
· Manufacturing, Marketing, Engineering, R&D, Employee Relations, Finance
· Most prevalent form
· Problem: Coordination of specialized activities
2. By Product:
· Major product divisions with substantial autonomy
· Each product line has own manager, manufacturing, selling
· Advantages: Profit centre accountability, better evaluation, maximum specialization
· Defects: Increases management cost
3. By Customers or Markets
· Exclusive to sales field
· Individual attention to diverse buyer groups
4. By Territory
· Market area broken into sales territories
· Regional/territorial managers
5. By Process
· Manufacturing sub-divided on basis of production process
· Similar machines grouped together
3.18 Matching People to Jobs
Why People Work - Motivation:
· Hygiene/Maintenance Factors (Below standard = dissatisfaction):
· Salary, Security, Status, Satisfaction
Man's Needs Hierarchy:
1. Physiological needs (food, clothing, shelter)
2. Safety needs (security, order)
3. Belonging needs (love, affection, identification)
4. Esteem needs (success, self-respect)
5. Self-fulfilment needs (achievement, growth)
Matching Components:
1. Knowledge - Education, learning
2. Skill - Related to job/category
3. Experience - Time, familiarity, judgement
4. Personality - Background, environment, way of life
Key Equation:
Job requirements = Person's capabilities and needs
3.19 Authority
Definition:
· Right (to command) and power to act
· Right to make decisions, direct work, give orders
· Legal power to request and if needed, take disciplinary action
Characteristics:
1. Given by Institution (legal/legitimate)
2. Not unlimited
3. Should be in writing (verbal in small orgs)
4. Must be commensurate with responsibility
5. Includes power to punish/reward
6. May be centralized or decentralized
7. Given to position, not holder
Kinds:
1. Rational-Legal Authority - From rules, regulations, policies
2. Traditional Authority - From tradition (e.g., eldest son succeeds)
3. Charismatic Authority - From exceptional powers/qualities (usually religion/politics)
3.20 Delegation of Authority
Definition:
Entrustment of responsibility and authority to another, creating accountability for performance.
Essential Elements:
1. Assignment of work/responsibility
2. Grant of authority
3. Creation of obligation/accountability
Principles:
1. Parity between authority and responsibility - Complete balance
2. Responsibility in terms of results - Specific on specific person
3. Unity of Command - Single executive only
4. Delegation of responsibility - Authority can be delegated, responsibility cannot
5. Overlapping of responsibilities - Must be avoided
6. Free flow of information - Two-way communication
7. Delegated authority - Adequate and per status/position
Problems in Delegation:
A. On Management/Executive part:
· Feeling of perfection
· Lack of ability to direct
· Lack of confidence in subordinate
· Fear of being exposed
· Absence of controls
· Conservative attitude
· Desire of dominance
B. On Subordinate part:
· Dependence on boss
· Fear of criticism
· Lack of self-confidence
· Overburdened with work
· Lack of proper facilities
· Lack of incentives
C. On Organisation part:
· Defective organisation structure
· Defective planning and policy formulation
· Lack of unity of command
· Lack of effective control mechanism
3.21 Delegation vs Decentralisation
· Delegation: Highly individualized relationship
· Decentralisation: Systematic/extensive use of delegation throughout organization
3.22 Co-equality of Authority and Responsibility
Key Principle:
· Responsibility = Task to be done
· Authority = Tool needed to perform task
· Must be carefully tailored to match
Imbalance Consequences:
· Authority exceeds responsibility → Arbitrary use, instability
· Responsibility exceeds authority → Holding people accountable for things they cannot control
3.24 Group Dynamics
Definition:
Social process by which people interact face-to-face in small groups.
Characteristics:
1. Groups do exist
2. Groups are inevitable and ubiquitous
3. Groups mobilize powerful forces
4. Groups may produce good or bad consequences
Reasons for Formation:
1. Need for companionship
2. Identification
3. Understanding from friends
4. Job satisfaction
5. Protection of members
6. Need for help in solving problems
Types:
1. Formal groups - Legitimate subunits (committees, project teams)
2. Informal groups - Created by socio-psychological forces
Advantages:
· Pleasant environment
· Satisfied needs/desires
· Easier work performance
· Psychological support
· Reduced supervision
· Organisation development
· Reduced turnover and absenteeism
· Security
Disadvantages:
· Set production norms below capability
· Resist innovation and change
· Oppose management policies
· Spread rumours
· Role conflict
· Jurisdictional disputes
3.25 Organisational Change (Dynamics of Change)
Definition:
Alteration of structural relationships and roles of people.
Causes (External Pressures):
1. Change in Technology and Equipment
2. Market situation changes
3. Social and political changes
Causes (Internal Pressures):
1. Changes in Managerial Personnel
2. Deficiencies in existing organisation
3. Employee's desire to share decision-making
4. Desire for higher wages
5. Improvement in working conditions
Response to Change:
Change Process (Kurt Lewin):
1. Unfreezing - Make individual realize current behaviour is no longer appropriate
2. Changing - Individual learns to behave in new ways (identification with model, internalization)
3. Refreezing - Practice new behaviour until it blends with other attitudes
Resistance to Change:
Individual Reasons:
1. Economic: Obsolescence of skills, fear of economic loss
2. Personal: Ego defensiveness, status quo, fear of unknown
3. Social: Social displacement, peer pressure
Organizational Reasons:
1. Threats to power and influence
2. Organizational structure
3. Resource constraints
4. Sunk costs
Overcoming Resistance:
1. Education and communication
2. Participation and involvement
3. Support
4. Incentives
5. Manipulation
6. Coercion
3.26 Organisational Development (O.D.)
Definition:
Long range effort to improve organization's problem solving and renewal processes through effective collaborative management culture.
Characteristics:
1. Educational strategy for planned change
2. Related to real problems
3. Uses laboratory training methods
4. Uses change agent/consultant
5. Close working relationship between change agent and people
6. Builds problem-solving capacity
7. Reaches all aspects of organization culture
8. Long term (3-5 years)
9. Broad-based variety of change programmes
10. Dynamic process
11. Uses systems thinking
12. Research based
13. Uses group processes
14. Situational and contingency oriented
Steps (Lawrence and Lorsch):
1. Problem identification (Diagnosis)
2. Planning strategy for change
3. Implementing the change
4. Evaluation
Organizational Development vs Management Development:
O.D. Management Development
Planned from top for organizational effectiveness Increases skill/ability of managers
Creates new team, changes attitudes, develops values Helps managers discharge responsibilities
Problem solving approach Education and training approach
Long range strategy Short range programmes
Requires trained specialists No special specialist service
3.27 Organisational Conflict
Definition:
Disagreement between organization members/groups arising from scarce resources, different statuses, goals, values or perceptions.
Stages:
1. Latent Conflict - Antecedent conditions, participants anticipate conflict
2. Perceived Conflict - Conflict is recognized
3. Felt Conflict - Emotional involvement
4. Manifest Conflict - Open aggression, sabotage, apathy, withdrawal
5. Conflict Aftermath - Positive or negative depending on resolution
Classes:
1. Individual conflict - Intra individual or inter-individual
2. Group level conflict - Intragroup or intergroup
3. Organisational conflict - Intra or interorganizational
Sources of Conflict:
· Different definitions of problem
· Different goals
· Different methods
· Different values
· Economic, social, psychological reasons
· Lack of consideration, appreciation, misunderstanding
Resolution:
Preventive Measures:
1. Effective leadership
2. Participative decision-making
3. Two-way communication
4. Improved interpersonal relationships
5. Facilities for informal groups
Curative Measures:
1. Analyse full details and stage
2. Understand issues (facts, goals, methods, values)
3. Conflict handling modes:
· Problem solving
· Mediation through persuasion
· Bargaining
· Politics
· Letting parties settle scores (last resort)
3.28 Managerial Leadership
Definition:
Behaviour that elicits voluntary follower behaviour beyond required performance.
Three Sets of Forces Before Choosing Leadership Style:
1. Forces in the manager - Background, knowledge, values, experience
2. Forces in the subordinates - Independence desire, decision-making responsibility, identification with goals, knowledge/experience, previous management experience
3. Forces in the situation - Organization's preferred style, work group, nature of tasks, time pressures, environmental factors
Two Styles:
1. Boss-centered leadership - Maximum authority, little freedom
2. Subordinate-centered leadership - Minimum authority, bigger freedom
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Chapter 4: Plant Location, Layout and Line Balancing
4.1 Concept and Factors Governing Plant Location
Definition:
· Plant: Place where men, materials, money, equipment, machinery are brought together
· Plant Location: Deciding suitable location/area for factory
Factors Affecting Plant Location:
1. Nearness to Raw Material - Reduces transport cost
2. Transport Facilities - Roads, rail, water, air
3. Nearness to Markets - Reduces transportation and spoilage
4. Availability of Labour - Right kind, adequate size, reasonable rates
5. Availability of Fuel and Power - Continuous, proper quantity, reasonable rates
6. Availability of Water - Adequate quantity, proper quality
7. Climatic Conditions - Less important with modern controls
8. Financial and Other Aids - Loans, subsidies
9. Land - Topography, area, cost, drainage
10. Community Attitude - Local people's attitude
11. Presence of related industries
12. Existence of hospitals, marketing centres, schools, banks
13. Local bye-laws, taxes, building ordinances
14. Housing facilities
15. Security
16. Facilities for expansion
4.2 Locational Economics
Costs to Consider:
1. Land
2. Building/Rent
3. Equipment and machinery
4. Labour
5. Water, power and fuel
6. Freight (incoming and outgoing)
7. Raw material
8. Taxes
Example 4.2 - Rate of Return Calculation:
\text{Rate of Return} = \frac{\text{Total Sales} - \text{Total Expenses}}{\text{Total Investment}} \times 100
4.3 Rural vs Urban Plant Sites
Urban Advantages:
· Well connected by rail, road, air
· Good market
· Right labour force
· Power and water available
· Good hospitals, schools, banks
· Existing buildings available
· Training and educational facilities
· Expert services available
· Ancillary industries
· Security
Urban Disadvantages:
· Limited land area
· High cost
· Rarely possible expansion
· High local taxes
· High labour salaries
· Union problems
Rural Advantages:
· Plenty of land
· Cheap land
· Trainable unskilled labour
· Good employee-employer relations
· No undesirable manufacturing neighbours
· No burdensome regulations/taxes
· Government inducements
Rural Disadvantages:
· No skilled labour
· Inadequate transport
· Power not available
· Far from markets
· No hospitals, educational/amusement centres
· No ancillary services
· Expert advice not available
· High grade executives may not like rural life
4.4 Plant Layout
Definition:
Disposition of various facilities and services of plant within selected site.
Objectives:
1. Minimize material handling
2. Eliminate bottlenecks and congestion
3. Design work stations properly
4. Allocate spaces to production/service centres
5. Minimize worker movements
6. Minimize waiting time
7. Safer, better working conditions
8. Flexibility for product changes and future expansion
9. Utilize cubic space
10. Improved work methods, reduced cycle times
11. Simpler plant maintenance
12. Increased productivity, better quality, reduced capital cost
13. Materials move at desired speed with lowest cost
Principles:
1. Integration - Logical/balanced arrangement of production centres
2. Minimum movements - Minimize workers and materials movement
3. Smooth and continuous flow - Remove bottlenecks
4. Cubic space utilization - Use length, width, height
5. Safe and improved environments - Well ventilated, dust-free
6. Flexibility - Adapt to changes with least cost/disturbance
4.5 Process Layout (Functional Layout)
Definition:
Similar machines or operations at one location.
Characteristics:
· All lathes at one place, milling machines at another
· Suitable for job order production
· Non-repetitive maintenance/manufacturing
Advantages:
1. Wide flexibility
2. Better equipment utilization
3. Less capital investment
4. Better product quality
5. Work more interesting
6. Sections independent
Disadvantages:
1. Needs more space
2. Automatic material handling difficult
3. More material-in-process
4. Longer product completion
5. Large work-in-process inventory
6. Difficult production control
7. Longer material travel distances
8. More inspections and coordination
4.6 Product Layout (Line Layout)
Definition:
Machines arranged in sequence of operations along product flow line.
Characteristics:
· Preferred for continuous production
· Automatic material handling
· Smooth work flow
Advantages:
1. Less space
2. Automatic material handling
3. Less in-process inventory
4. Shorter completion time
5. Better coordination, simpler planning
6. Smooth work flow
7. Less skilled workers
Disadvantages:
1. Product change requires major layout changes
2. Pace depends on slowest machine
3. Higher capital investment
4. Difficult inspection
5. Difficult to increase production beyond capacity
4.7 Combination Layout
Definition:
Combination of process and product layouts.
Use when:
· Items made in different types and sizes
· Same sequence of operations regardless of variation
· Number of items produced in same sequence but none in bulk
4.8 Fixed Position Layout
Definition:
Men and equipment moved to material (product remains at one place).
Applications:
· Ship building
· Aircraft manufacture
· Big pressure vessels fabrication
Advantages:
1. Skilled workers assigned from start to finish
2. Least movement of materials
3. Maximum flexibility
4. Different projects can be taken
Disadvantages:
1. Low work-in-progress content
2. Low labour/equipment utilization
3. High equipment handling costs
4.9 Flow Pattern
Types:
1. Line Flow - Simplest, material enters at one end, leaves at other
2. L-type Flow - For wide but less long buildings
3. Circular Flow - Rotary handling systems
4. U-type Flow - Entrances and exit on same side
5. S or Inverted S - For long production lines in square buildings
6. Combination patterns - Various combinations of above
4.10 Work Station Design
Space Requirements:
1. Worker standing/sitting/turning space
2. Machine space (including overhang, overtravel)
3. Space for work (e.g., long bar on turret lathe)
4. Bins for incoming/processed goods
5. Tools and supplies
6. Additional accessories, jigs, fixtures
7. Space to load large work
Other Factors:
· Space for material handling equipment
· Easy access to safety stops
· Easy access for inspection, lubrication, maintenance
· Convenience for foundations and installation
· Aisle space
· Ventilation, lighting, safety
4.11 Methods of Plant and Factory Layouts
1. Process Flow Charts - Show how components assemble
2. Material Movement Patterns - Trace material flow
3. Layout Analogues:
· Templates (2D): Cardboard, coloured paper, celluloid (scale 1/50)
· Advantages: Least costly, readily interpreted
· Disadvantages: Non-technical find difficult
· Three-Dimensional Models: Wood or diecast plastic
· Advantages: Easy for laymen, quick to shift, check overhead structures
· Disadvantages: Expensive, need storage
4. Correlation Chart - Grid with rows for alternative solutions
· Apply constraints and objectives
· Feasible solution from path of open squares
5. Travel Chart - Record of material travel between machines/departments
· Helps improve existing layout
· Shows relative importance of having pairs close
6. Load Path Matrix Method - Reduce transportation of in-process inventory
· Departments with mass flow placed close together
4.12 Storage Space Requirements
Items requiring storage:
1. Incoming new materials
2. Checking and sorting
3. Inspection
4. Temporary storage
5. In-process inventory
6. Tools and supplies
7. Finished products
Factors determining space:
1. Size and weight
2. Quantities
3. Frequency of use
Storage Equipment:
· Bins, drums, barrels, racks, shelves, tanks, tote boxes, pallets
Aisle Design:
· Main aisles: 1.5-3 metres wide
· Sub-aisles: 75 cm wide
4.13 Plant Layout Procedure
Steps:
1. Accumulate basic data (volume, specifications, process sheets, standard times)
2. Analyse and coordinate basic data
3. Decide equipment and machinery required
4. Select material handling system
5. Sketch plan of plot
6. Determine general flow pattern
7. Design individual work station
8. Assemble individual layout into total layout
9. Calculate storage space required
10. Make flow diagrams and allocate to plot plan
11. Plan and locate service areas
12. Make master layout
13. Check final layout
14. Get official approval
15. Install approved layout
4.14-4.17 Factory Building
Considerations:
1. Nature of manufacturing process
2. Flexibility
3. Expandability
4. Service facilities
5. Employee facilities
6. Lighting
7. Heating
8. Ventilating
9. Air-conditioning
Lighting Standards:
Type of Work Illumination (foot candles)
Passage ways 5
Stair ways 10
Rough work 15
Normal work 30
Ordinary bench work 50
Fine work 70
Fine assembly 100
Minute precision work 200-1000
Noise Levels:
Source Distance (metres) Intensity (decibels)
Hydraulic press 1 130
Large pneumatic riveter 1.25 128
Pneumatic chipper 1.5 124
Multiple sand-blast 1.25 118
Automatic punch press 1 112
Cut-off saw 0.60 108
Automatic lathe 1 98
Types of Factory Buildings:
1. Single storey buildings
2. High bay and monitor types
3. Multi-storey buildings
4. Special type buildings
Types of Construction:
1. Wood frame
2. Brick construction
3. Slow burning mill construction
4. Steel frame construction
5. Reinforced concrete construction
6. Precast concrete construction
4.18 Line Balancing
Definition:
Grouping facilities/tasks to minimize idle time.
Heuristic Approach:
· Use common sense, logic, past experience
· Break complex problem into manageable subproblems
· Advantages: Consistency, speed, ability to cope with more data
Line Balancing Steps:
1. Identity the work (job)
2. Break down into elemental tasks
3. List steps with predecessors and durations
4. Sketch precedence diagram
5. Assign tasks to stations (cycle time)
6. Apply permutability and lateral transferability
Key Concepts:
· Permutability: Any tasks can be combined (total time ≤ cycle time)
· Lateral Transferability: Shift tasks laterally if precedence maintained
Example:
Cycle time = 10 minutes, Total task duration = 38 minutes
Minimum stations = 38/10 = 4
Linear Programming Method:
· Cycle time constraint: Σ tᵢ Xᵢⱼ ≤ c
· Task constraint: Each task assigned to one station
· Precedence constraints: Tasks in proper sequence
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Chapter 5: Product Design, Planning and Development
5.1 Introduction to Product Design
Sources of New Ideas:
1. Customer's suggestions and complaints
2. R&D department
3. Competitor products
Departments Involved:
1. Marketing
2. R&D
3. Design
4. Manufacture
5. Accounts
6. Personnel
Design Deals with:
· Form design: Shape and appearance
· Functional design: Working
5.2 Effect of Design on Cost
Product Cost Components:
1. Direct labour cost
2. Direct material cost
3. Direct expenses
4. Indirect expenses
Cost Reduction Aspects:
1. Materials: Cheaper, correct, easily workable
2. Standard parts: Reduce cost
3. Fewer parts: Lesser product cost
4. Tolerances: Not unnecessarily tight
5. Surface finish: Not too high
6. Make or buy decisions: Purchase if not economical
7. Existing equipment: Use if feasible
8. Minimum operations: Reduce machining
9. Simple design: Without complications
5.3 Requirements of Good Product Design
Customer Satisfaction:
1. Correct function
2. Desired accuracy
3. Required reliability
4. Easy operation
5. Easy servicing accessibility
6. Good space utilization
7. Sufficient ruggedness
8. Pleasant appearance
9. Reasonable price
Adequate Profit:
1. Easy to manufacture
2. Process based on quantity
3. Use standard components
4. Minimum number of parts
5. Minimum number of operations
6. Short throughput time
7. Easy to pack and distribute
5.4 Factors Affecting Product Design
1. Technical Factors:
· Operating conditions
· Performance
· Maintenance
· Company experience
2. Industrial Design Factors:
· Function
· Appearance
· Ergonomics
3. Production-Economic Factors:
· Materials (specification, yield, content)
· Methods (equipment, layout, labour, tolerance, tooling, overheads)
· Standards (simplicity, parts, standard parts)
· Finish (painting, polishing, electroplating)
5.5 Design by Imitation
Definition:
New designs from imitating successful products rather than innovation.
Advantages:
· Saves R&D money
· Avoids risk of being unsuccessful
· Only successful designs imitated
Note: Imitators start late but move faster than innovators.
5.6 Design Specifications and Drawings
Drawings Include:
1. Component part number and description
2. Dimensions from common datum face
3. Tolerances and limits
4. Material details
5. Finish description
6. Title block
7. Scale and projection
8. Inspection requirements
Specifications (Bill of Material) Include:
· Part numbers and descriptions
· Material specification, size, condition
· Quantity per assembly
· Testing conditions
· Efficiency of performance
· Quality of material and finish
5.7 Product Planning
Definition:
Evaluation of range, mix, specification and pricing of existing/new products; planning product range to satisfy company objectives; specifying research, design and development support.
Need:
· Determines production volume and rate
· Forms basis for budgets
· Suggests plant expansion needs
· Emphasizes product research and development
· Suggests changes in production methods
· Helps establish pricing policies
· Decides advertising, product distribution
Constituents:
1. Marketing and Marketing Analysis
2. Feasibility Studies
3. Advanced Planning
Feasibility Study Outputs:
· System Operational Concept: Mission, operating characteristics, quantity, anticipated usage, effectiveness factors, environment
· System Maintenance Concept: Maintenance levels, repair policies, support requirements
Maintenance Levels:
1. Organizational Maintenance: At operational site, limited to periodic checks, visual inspections, cleaning, component replacement
2. Intermediate Maintenance: By specialized organizations, repairs by replacing major modules/assemblies
3. Depot Maintenance: Highest level, complete overhauling, rebuilding, calibration
Evaluation Criterion Factors:
1. Technology available (now, 1-5 years, >5 years)
2. System technical characteristics (performance, operational availability)
3. Marketing information (market potential, market share)
4. Financial data (return on investment, annual sales, investment recovery point)
Specification Types:
1. System Specification: Technical, operational, support requirements
2. Development Specification: Technical requirements for R&D items
3. Procurement Specification: For off-the-shelf items
4. Process Specification: Services (heat-treating, plating, welding)
5. Material Specification: Raw materials, mixtures
Product Proposal Classification:
1. Internal Proposal: Generated within firm, directed to management
2. External Proposal: Directed to outside agency (contracts, funding, profit)
5.8 Product Classification
1. Convenience Goods: Cigarettes, candy, magazines (found near checkout)
2. Shopping Goods: More expensive, buyers compare (garments, cars)
3. Speciality Goods: Extraordinary pains to obtain (hobbyist items)
4. Industrial Goods: Raw materials, semi-finished goods, machinery
5.9 Product Development
Definition:
Most economically feasible method for applying principles identified through Research.
Product Research and Development:
1. Functional efficiency
2. Quality
3. Unexplored uses
4. Materials investigation and substitutes
5. Waste product utilization
6. Standardization and customer satisfaction
Product Development Methods:
1. Imitation - Marketing similar product
2. Adaptation - Improved product for existing market
3. Invention - New product (synthetic fibres, nylon)
Development Procedure:
1. Get new ideas
2. Separate good and feasible ideas
3. Evaluate ideas technically
4. Evaluate from market perspective
5. Take final decision
6. Get into production
7. Introduce product into market
5.10 Standardization
Definition:
Producing maximum variety of products from minimum variety of standardized materials, parts, tools and processes.
Procedure:
1. Decide what to sell using market research
2. Define standard range of products
3. Develop minimum variety of components
Advantages by Department:
Department Benefits
Design Fewer specifications/drawings, more time for new designs
Manufacturing Lower unit costs, better quality, accurate delivery, better methods, effective training
Marketing Better quality at reasonable prices, greater sales volume, increased margin, better delivery
Production Planning Improved methods, processes, layouts; more efficient tool design
Production Control Well-proven design improves planning/control; fewer delays
Purchase/Stock Less variety, favourable purchase contracts, better control
Quality Control Better inspection, familiar workers, quality standards
Work-study Efficient breakdown into short cycles
Supervision Efficient department running, less wasted time, reduced rejections
Disadvantages:
1. Reduction in choice
2. Changes in public taste
3. Difficult to introduce new models
4. Favours large companies
5. Resistance to change
5.11 Simplification
Definition:
Process of reducing variety of products manufactured (variety reduction).
Considerations:
1. Can simplification be effectively achieved?
2. How will it affect customer demand and sales volume?
3. Does market competition permit simplification or encourage diversification?
Advantages:
1. Fewer parts, varieties, changes
2. Reduced manufacturing operations and risk of obsolescence
3. Quick delivery and better after-sales service
4. Reduced inventory, better inventory control
5. Lower production costs
6. Improved product quality
5.12 Specialization
Definition:
Concentrating efforts on particular field of action, division of labour.
Advantages:
1. High state of skill and proficiency
2. Smaller completion times
3. Higher salaries and standard of living
Limitation:
1. Not flexible (cannot be used for other purposes)
2. May result in monotony
Applications:
· Products, Processes, Individuals, Companies, Jobs, Equipments
5.13 Diversification
Definition:
Addition of new products or introduction of established products into new markets.
Reasons:
1. Survival: Offset declining markets, obsolete facilities, profit margins
2. Stability: Offset seasonal/cyclical fluctuations, balance high/low margin products
3. Productive Utilisation: Use waste/by-products, raw materials, excess capacity
4. Adaptation: Meet demands of diversified dealers, specific customer requests
5. Growth: Counter market saturation, reinvest earnings
6. Miscellaneous: Maintain leadership, tax advantages
5.14 Interchangeability
Definition:
Any standardized component will assemble correctly with any mating component, chosen at random.
First established by: Eli Whitney (1798) for ten thousand muskets.
Requirements:
1. Appropriate component tolerances specified
2. Manufacturing process selected to make within specified tolerances
3. Inspection and quality control to check only within tolerance
Fits:
1. Clearance Fit: Largest shaft < smallest hole (sliding, running)
2. Interference Fit: Smallest shaft > largest hole (press, shrink/force)
3. Transition Fit: Between interference and clearance (push, light keying)
Allowance:
Variation given for different classes of fits.
· Shaft basis: Keeping shaft diameter constant
· Hole basis: Keeping hole diameter constant (modern systems prefer this)
Tolerance Types:
· Unilateral: Tolerance on one side (20.00 +0.02)
· Bilateral: Tolerance on both sides (20.00 ±0.01)
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Chapter 6: Process Planning and Group Technology
6.1 Introduction and Concept
Definition:
Systematic determination of methods by which a product is to be manufactured economically and competitively.
Process Planning is:
· Intermediate stage between product design and manufacturing
· Subsystem responsible for converting design data to work instruction
· Concerned with preparation of route sheet
Inputs to Process Planning:
1. Drawings/specifications (what to make)
2. Forecasts/orders/contracts (how many to make)
Output:
Route sheet - listing of sequence of operations and machines.
6.3 Information Required
1. Quantity of work and product specifications
2. Quality of work
3. Availability of equipments, tools, personnel
4. Sequence of operations
5. Names of equipments
6. Standard time for each operation
7. When operations will be performed
6.4 Process Planning Procedure
1. Preparation of working drawings
2. Deciding to make or buy
3. Selection of manufacturing process
4. Machine capacity and equipment selection
5. Selection of material and bill of materials
6. Selection of jigs, fixtures and other attachments
7. Operation planning and tooling requirements
8. Preparation of documents (operation and route sheets)
6.5 Working Drawing
Requirements:
1. Are dimensioning and datum surfaces compatible with machining practices?
2. Are sufficient stock allowances provided?
3. Are clearance and access allowed for assembly?
4. Are tolerances realistic and statistical tolerancing used?
5. Are adequate clamping and locating surfaces provided?
6.6 Make or Buy Decision
Factors:
1. Quantitative:
· Opportunity costs: Monetary value sacrificed in rejecting alternative
· Incremental costs: Costs that vary with decision
· Idle facilities: Availability affects incremental costs
2. Qualitative:
· Product quality
· Patents
· Skills and materials
· Long-term considerations
Example 6.1:
· Cost to purchase: Rs. 8.50/part, 100,000 parts/year
· Manufacturing estimates:
· Fixed costs increase: Rs. 50,000
· Labour costs rise: Rs. 125,000
· Raw materials: Rs. 600,000
· Overhead increase (12% of Rs. 500,000): Rs. 60,000
· Total: Rs. 835,000
· Cost per part: Rs. 8.35
· Decision: Make (saves Rs. 0.15/part)
6.8 Machine Capacity
Definition:
Time available for work at a machine expressed in machine hours.
Capacity Levels:
Level Description
Maximum 168 hours/week (7×24)
Planned Maximum + Overtime
Running time (planned) Planned - Machine down time - Idle machine time - Ancillary time
Standard Machine Running Adjusted for performance variation
Machine Ratios:
(i) \text{ Machine utilisation} = \frac{\text{Machine available time}}{\text{Total machine time}} \times 100
(ii) \text{ Machine efficiency} = \frac{\text{Standard running time}}{\text{Actual running time}} \times 100
(iii) \text{ Machine effective utilization} = \frac{\text{Standard running time}}{\text{Machine available time}} \times 100
6.9 Process and Equipment Selection Procedure
1. Develop general statement of manufacturing operations
2. Establish provisional process for each feature
3. Develop list of process alternatives
4. Compare provisional with alternatives
5. Communicate process selection to all departments
6. Perform detailed processing
6.10 Selection of Materials, Jigs, etc.
Bill of Material (Parts List) Includes:
1. Product name and code
2. Sheet number
3. Date of preparation
4. Preparer and checker names
5. Item numbers
6. Make/purchase designations
7. Subassembly part numbers and names
8. Quantity requirements
9. Material used in each part
Selection of Jigs/Fixtures:
· Necessary for higher production rate
· Reduce cost of production per piece
Selection of Cutting Tools and Gauges:
· Reduce production time
· Inspect accurately and at faster rate
6.11 Process Analysis
Steps:
1. Select process for analysis
2. Break down into operations and sub-operations
3. Construct process chart and flow diagram
4. Analyse using questioning procedure
5. Reconstruct for modified procedure
6. Test proposed method
7. Explain new method and implement
6.12-6.16 Process Charts
Process Chart Symbols:
· Operation (circle)
· Inspection (square)
· Transport (arrow)
· Delay (D)
· Storage (triangle)
Outline Process Chart:
· Surveys and records overall picture
· Shows relationship between activities
· Uses only operation and inspection symbols
Operation Sheet:
· Record showing how operation should be carried out
· Indicates route through departments
· Shows sequence of operations, machines, tools, time
Route Sheet:
· Summarizes operations required
· Preferred sequence
· Auxiliary tools required
· Estimated operation times
6.17-6.19 Process Planning Types
Manual Process Planning:
· Man-variant process planning
· Commonest type used today
· Planner selects combination of processes
Automated Process Planning:
· Eliminates human effort between drawing and process plan
· Levels of automation:
· (a) Fully automated (includes scanning/drawing interpretation)
· (b) Human assistance for coding drawing data
· (c) Human selects process and codes drawing
Generative Process Planning:
· Synthesizes process information automatically
· Creates process plan from manufacturing database
· Little/no human intervention
· Steps:
1. Describe part in detail
2. Describe catalog of processes
3. Describe machine tools
4. Create software to check compatibility
Advantages of CAPP:
1. Reduces planning time (days to hours/minutes)
2. Reduces skill required
3. Creates more consistent plans
4. More accurate plans
5. Increases productivity
6. Reduces planning and manufacturing costs
6.20 Group Technology (GT)
Definition:
Replacing traditional jobbing shop manufacture by analyzing and grouping work into families, forming groups of machines to manufacture families on flow-line principle.
Objectives:
1. Reduce work-in-progress
2. Improve delivery performance
3. Reduce throughput time
Problems in Small Batch Production:
1. Large variety of components
2. Long and uncertain throughput times
3. Delivery problems
4. Excessive work-in-progress
5. High finished goods stocks
6.21 Functional vs Group/Cell Layouts
Functional Layout:
· Similar machines grouped together
· Considerable back-tracking
· Large number of setups
· High material handling costs
· High work-in-process inventory
Group/Cell Layout:
· Different machines grouped into cells
· Based on part families
· Semi-flowline arrangement
· Minimizes transportation and waiting
Advantages of Group Layout:
1. Reduced transportation and queuing time
2. Minimized resetting times (quick-change tools)
3. Reduced throughput time
4. Simpler production control
5. Standardization of design and production
6. More effective design
7. Less stock and fewer purchases
8. Simplified production planning
9. Reduced tooling and setup times
10. More efficient utilization of machines
6.22-6.23 Component Families
Types of Component Families:
1. Identical shape and function (e.g., spur gears, bushes)
2. Identical in shape, different in function (bearing flanges, rings, spacers)
3. Similar in shape (shafts, bolts, spindles)
Optiz Coding System:
· 5-digit primary code + 4-digit supplementary code
· Primary code: Geometrical code for shape characteristics
· Supplementary code: Dimensions, material, thickness
· Example: AB 5919 9005 2110 (Drawing No. + Primary code + Supplementary code)
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Chapter 7: Production Planning and Control
7.1 Introduction
Functions of PPC:
1. Forecasting - Estimation of type, quantity, quality of future work
2. Order writing - Authority to undertake job
3. Product design - Specifications, bill of materials, drawings
4. Process planning and routing - Most economical process
5. Material control - Requirements and control of materials
6. Tool control - Requirements and control of tools
7. Loading - Assignment of work to manpower, machinery
8. Scheduling - Time phase of loading
9. Dispatching - Transition from planning to action
10. Progress reporting - Data collection and interpretation
11. Corrective action - Expediting and replanning
7.2 Continuous and Intermittent Production
Continuous Production:
· Continuous or almost continuous physical flow
· Special purpose machines
· Standardized items in large quantities
Types:
A. Mass and flow line production
B. Continuous or process production
Intermittent Production:
· Intermittent flow of material
· General purpose machines
· Different components in small quantities
Types:
C. Batch production
D. Job production
Mass/Flow Production Characteristics:
1. Considerable division of labour
2. Machinery laid by production sequence
3. Minimum material handling
4. Very little resetting time
5. Balanced work flow
6. Short, repetitive work cycles
7. Time study can be applied
8. Small work-in-progress
9. Proper attention to methods, tools, handling
10. Designed for production requirements
11. For continuous, regular demand
12. Lowest production cost per unit
Batch Production Characteristics:
1. Very common type
2. Articles in batches per specific order
3. Examples: Drugs, clothes, paints
4. Division of labour possible
5. Intermittent material flow
6. Process type layout
7. Automation and mechanization possible
8. Proper maintenance essential
9. Process/product planning for each batch
10. Expediting and corrective action necessary
11. Good production control system needed
Job Order Production Characteristics:
1. Intermittent/discontinuous flow
2. Mechanization and division of labour not economical
3. Each job different
4. Product design takes time
5. Difficult prior planning
6. Schedule for each component
7. General purpose machinery, flexible layout
8. Skilled workers
9. High degree of control essential
10. Examples: Special purpose equipment, large turbo generators
11. Very small number of items (even one)
7.5 Forecasting
Definition:
Estimation of type, quantity and quality of future work.
Purpose:
1. Determines production volume and rate
2. Forms basis for budgets
3. Suggests plant expansion
4. Emphasizes product R&D
5. Suggests production method changes
6. Helps pricing policies
7. Helps advertising and distribution
Four Basic Elements:
1. Trends - Long term movements (slow direction)
2. Cycles - Shorter duration (expansion/contraction)
3. Seasonal variations - Recur within year
4. Irregular variations - Unforeseen events
7.5.4 Forecasting Techniques
1. Historic Estimate
· Assumes past = future
· Useful if economy is static
· Not scientifically valid
2. Sales Force Estimate
· Those in contact with market know best
· Salesmen estimates → District Manager → Factory Sales Manager
3. Trend Line (Time Series Analysis)
· Plot historical data vs time
· Single best fitting line (statistical technique)
· More reliable than historic estimate
4. Market Survey
· For new products (no past data)
· Introduce in small area, project results
5. Delphi Method
· Panel of experts through questionnaires
· Eliminates bandwagon effect
· Good for long-range and new-product forecasts
6. Judgmental Techniques
· Opinions of consumers/customers
· Retail/wholesale dealer opinion
· Area sales managers opinion
7. Prior Knowledge
· Used by ancillary units
· Large organisation informs how many to make
8. Forecasting by Past Average
\text{Forecasted sales} = \frac{\text{Sum of previous period sales}}{\text{Number of periods}}
9. Forecasting from Last Period's Sales
· Eliminates past data influence
· Forecast = previous period sales only
10. Moving Average
· Compromise between past average and last period
· Smoothes sales pattern
11. Weighted Moving Average
· Different weights to each element
· Sum of weights = 1
Example:
F_5 = 0.40(95) + 0.30(105) + 0.20(90) + 0.10(100) = 97.5
12. Exponential Smoothing
· Overcomes moving average disadvantages
· Only previous forecast and latest sales needed
\text{New forecast} = \alpha(\text{latest sales}) + (1-\alpha)(\text{old forecast})
\alpha = \frac{2}{N+1} \text{ (for N-period moving average equivalent)}
13. Econometric Forecasting
· Cause-and-effect relationship
· Uses correlation and regression
---
Key Formulas Summary
Concept Formula
Productivity Output/Input
Rate of Return (Sales - Expenses)/Investment × 100
Machine Utilisation Machine available time/Total machine time × 100
Machine Efficiency Standard running time/Actual running time × 100
Machine Effective Utilisation Standard running time/Machine available time × 100
Exponential Smoothing α(latest) + (1-α)(old forecast)
Moving Average Equivalent α = 2/(N+1)
Price Elasticity [(Q₂-Q₁)/(Q₂+Q₁)] ÷ [(P₂-P₁)/(P₂+P₁)]
---
Key Definitions
· Industrial Engineering: Design, improvement, installation of integrated systems of people, materials, equipment, energy
· Productivity: Ratio of output to input
· Organisation: Process of identifying/groping work, defining responsibility/authority, establishing relationships
· Authority: Right to command and power to act
· Responsibility: Obligation to perform assigned duty
· Delegation: Entrustment of responsibility and authority with accountability
· Standardization: Maximum variety from minimum variety of standardized items
· Simplification: Reducing variety of products
· Specialization: Concentrating efforts on particular field
· Diversification: Addition of new products or new markets
· Interchangeability: Components assemble correctly with any mating component
· Process Planning: Systematic determination of manufacturing methods
· Forecasting: Estimation of future work
· Scheduling: Time phase of loading
# Industrial Engineering & Management: Comprehensive Reference Manual
## Chapter 1: Industrial Engineering and Management
### 1.1 Concept of Industrial Engineering
#### Definition (AIIE)
Industrial Engineering is concerned with the design, improvement, and installation of integrated systems of **people**, **materials**, **equipment**, and **energy**. It draws upon specialized knowledge and skill in the mathematical, physical, and social sciences together with the principles and methods of engineering analysis and design to specify, predict, and evaluate the results to be obtained from such systems.
```
┌──────────────────────────────────────────────┐
│ INTEGRATED SYSTEM │
│ [People] [Materials] [Equipment] [Energy] │
└──────────────────────┬───────────────────────┘
│
▼
┌───────────────────────────────────────────────────────────┐
│ ENGINEERING ANALYSIS │
│ • Resource Utilization • Cost Reduction │
│ • System Optimization • Waste Minimization │
└──────────────────────┬────────────────────────────────────┘
│
▼
┌───────────────────────────┐
│ PRODUCTIVITY IMPROVEMENT │
│ • Higher Output / Input │
│ • Minimal Waste │
└───────────────────────────┘
```
#### Key Focus Areas
* **Resource Analysis:** Engineering approach applied to resource consumption, operational flow, and overall cost structures.
* **Core Resources (5 Ms):** Men, Money, Materials, Equipment (Machinery), and Methods.
* **Primary Objective:** Continuous **Productivity Improvement**.
#### Principles of Productivity Improvement
1. **Resource Efficiency:** Maximum utilization of raw inputs.
2. **Waste Elimination:** Minimizing non-value-adding activities per unit of input.
3. **Output Maximization:** Increasing total throughput for fixed input levels.
### 1.2 History and Development
#### The Industrial Revolution (c. 1750s)
* **Textile Innovations:** Flying shuttle, spinning jenny, and power loom revolutionized mass fabric creation.
* **Steam Power:** Development of James Watt’s steam engine decoupled factory locations from waterways.
* **Tooling Precision:** Rapid advances in metal cutting, precision grinding, and standardized machine tools.
#### Key Contributors
| Contributor | Landmark Work / Concept | Core Contribution |
|---|---|---|
| **Adam Smith** | *The Wealth of Nations* (1776) | Concept of Division of Labor to boost output. |
| **Charles Babbage** | *On Economy of Machinery* (1832) | Early analytical engine concepts and time studies. |
| **Henry R. Towne** | *The Engineer as an Economist* (1886) | Urged engineers to evaluate economic factors. |
| **Frederick A. Halsey** | Halsey Premium Plan | Incentive wage plan based on saved working time. |
| **Henry L. Gantt** | Gantt Chart | Visual project scheduling tool tracking task progress. |
| **Frederick W. Taylor** | *Principles of Scientific Management* | Father of Scientific Management; time study and metal cutting research. |
| **Frank & Lillian Gilbreth** | Motion Study & Therbligs | Micro-motion analysis to eliminate unnecessary steps. |
#### Historic Milestones
* **1908:** Creation of the first formal IE academic departments at **Pennsylvania State University** and **Syracuse University**.
* **1933:** First Ph.D. in Industrial Engineering awarded to **Ralph M. Barnes** at **Cornell University**.
* **1940–1946:** Development of Predetermined Time Standards (MTM, Work-Factor), Value Engineering, and early Operations Research.
#### Post-WWII Developments
* **Operations Research (O.R.):** Application of mathematical modeling to complex decision problems.
* **Digital Computing:** Integration of computing power into inventory, scheduling, and production tracking.
* **Systems Analysis & Design:** Viewing operations as dynamic inter-related systems.
* **Network Planning Techniques:** Introduction of **PERT** (Program Evaluation and Review Technique) and **CPM** (Critical Path Method).
* **Human Factors & Ergonomics:** Incorporating behavioral sciences and biomechanics into workstation layout.
### 1.3 Roles of the Industrial Engineer
The modern Industrial Engineer acts across fifteen crucial functional personas:
1. **Advisor / Consultant:** Evaluates system data and advises executive management.
2. **Advocate / Activist:** Champions process efficiency, safety, and continuous improvement.
3. **Analyst:** Deconstructs complex systems to uncover bottlenecks and inefficiencies.
4. **Boundary Spanner:** Bridges the operational gap between technical teams and end-users.
5. **Motivator:** Encourages shop-floor teams toward operational excellence.
6. **Decision Maker:** Selects optimal paths among competing engineering constraints.
7. **Designer / Planner:** Engineers complete operational workflows, layouts, and supply systems.
8. **Expert:** Supplies deep technical knowledge in ergonomics, timing, and statistics.
9. **Coordinator / Integrator:** Harmonizes cross-departmental operations.
10. **Innovator / Inventor:** Introduces novel tools, automation, and lean paradigms.
11. **Measurer:** Establishes performance baselines using precise data collection techniques.
12. **Project Manager:** Oversees implementation scope, timeline, and budgetary controls.
13. **Trainer / Educator:** Upskills personnel in new techniques and quality standards.
14. **Data Gatherer:** Systematically samples operational variables.
15. **Negotiator:** Reconciles line worker safety with production targets.
### 1.4 Applications of Industrial Engineering
```
IE APPLICATIONS
│
┌──────────────────────────┴──────────────────────────┐
▼ ▼
Pre-1940 Paradigm Post-1940 Era
(Manufacturing Focus) (Service & Systems)
────────────────────── ─────────────────
• Work Standards • Construction & Transport
• Method Improvement • Air Transportation & Defense
• Production Control • Healthcare & Public Utilities
• Wage Incentives • Financial Services & Retail
```
### 1.5 Production Management
Production management involves two main domains: system design decisions and daily execution controls.
```
┌─────────────────────────────────────────┐
│ PRODUCTION MANAGEMENT CYCLE │
└────────────────────┬────────────────────┘
│
┌──────────────────────────────┴──────────────────────────────┐
▼ ▼
┌──────────────────────────────┐ ┌───────────────────────────┐
│ DESIGN OF SYSTEMS │ │ CONTROL SYSTEMS │
│ (Strategic Decisions) │ │ (Tactical Decisions) │
├──────────────────────────────┤ ├───────────────────────────┤
│ • Product & Process Design │ ─── Implementation ───► │ • Inventory Policies │
│ • Plant & Layout Design │ │ • Quality Control │
│ • Equipment Selection │ ◄── Evaluative Loop ─── │ • Scheduling & Routing │
│ • Job & Skill Specifications │ │ • Cost & Variance Control │
└──────────────────────────────┘ └───────────────────────────┘
```
### 1.6 Production Management vs. Industrial Engineering
| Aspect | Production Management | Industrial Engineering |
|---|---|---|
| **Core Focus** | Administrative concepts and techniques for managing production processes. | Engineering analysis, design, optimization, and control of productive systems. |
| **Operational Scope** | Directing human efforts, resource allocation, and maintaining operational output. | Designing the complete technical framework and optimizing line interactions. |
| **Analogy** | **Aircraft Pilot:** Operates the vehicle within specified operational guidelines. | **Aircraft Designer:** Engineers the structure, efficiency, and system mechanics. |
### 1.7 Operations Management
* **Definition:** The evolution of manufacturing management applied to transformation activities across **any** manufacturing or service organization.
* **Operating System Definition:** A collection of components that transforms raw inputs into higher-value outputs.
```
INPUTS TRANSFORMATION PROCESS OUTPUTS
┌─────────┐ ┌───────────────────────────┐ ┌──────────┐
│ People │ │ • Physical Alteration │ │ Goods │
│ Material│ ───────────► │ • Transport / Location │ ────────────► │ & │
│ Facilities │ • Storage & Protection │ │ Services │
│ Info │ │ • Information Synthesis │ └──────────┘
└─────────┘ └───────────────────────────┘
```
### 1.8 Management Science (MS)
#### Definition
"A problem-solving process used by an interdisciplinary team to develop mathematical models that represent simple-to-complex functional relationships, providing management with a basis for decision-making."
#### Key Characteristics
1. **Systems Overview:** Analyzes problem spaces from a global system perspective.
2. **Interdisciplinary Approach:** Combines insights across distinct technical domains:
* **Mathematician:** Formalizes variables and theoretical relationships.
* **Chemical/Process Engineer:** Analyzes fluid dynamics and physical flows.
* **Cost Accountant:** Quantifies financial impact and unit costs.
3. **Uncovering New Problems:** Solves core symptoms while revealing root system constraints.
4. **Modeling-Process Approach:** Relies heavily on numerical, programmatic, and deterministic models.
5. **Decision-Centric:** Focuses directly on managerial choices.
6. **Scientific Rigor:** Employs empirical testing and structured experimentation.
7. **Computational Dependence:** Leverages computer processing for complex algorithms.
8. **Economic Basis:** Evaluates outcomes based on cost-benefit metrics.
### 1.9 Tools of Management Science
| Management Science Tool | Primary Operational Application |
|---|---|
| **Decision Matrices** | Resource allocation or investment choices with a finite list of clear alternatives. |
| **Decision Trees** | Multi-stage decision processes incorporating risk and sequential choices over time. |
| **Mathematical Programming** | Linear, non-linear, or integer optimization under resource constraints. |
| **Branch and Bound** | Optimization across large or combinatorial solution spaces. |
| **Network Models** | Project scheduling, shortest path analysis, and routing (PERT/CPM). |
| **Dynamic Programming** | Multi-stage, interdependent decision problems solved recursively. |
| **Markov Chains** | Modeling state transitions and long-run probabilities (e.g., equipment failures). |
| **Game Theory** | Strategic decision-making in competitive or adversarial conditions. |
| **Inventory Models** | Economic Order Quantity (EOQ) to minimize ordering and carrying costs. |
| **Queuing Theory** | Service capacity design, bottleneck analysis, and line wait-time optimization. |
| **Simulation Models** | Replicating complex system behavior without risking real-world downtime. |
#### Five Core Types of Simulation Models
1. **Artificial Intelligence:** Mimics cognitive decision paths and pattern recognition.
2. **Heuristic Programming:** Rule-of-thumb algorithms for fast, effective solutions.
3. **Management Games:** Interactive scenarios for training executive teams.
4. **Systems Simulation:** Continuous or discrete modeling of full physical plants.
5. **Monte Carlo Simulation:** Probabilistic modeling using repeated random sampling.
### 1.10 Managerial Economics
Applying economic principles to resolve operational and managerial choices.
#### Four Core Economic Principles
1. **Incremental Principle:** A decision is sound if it increases total revenues more than total costs, or reduces costs more than revenues.
2. **Time Perspective:** Decisions must balance immediate short-term returns against long-term structural effects.
3. **Opportunity Cost Principle:** Cost is measured by the sacrificed returns of the next best alternative.
4. **Discounting Principle:** Future costs and revenues must be discounted to present value:
#### Price Elasticity of Demand (E)
Measures demand sensitivity relative to price movements:
*Where:*
* Q_1, Q_2 = Initial and updated demand quantities
* P_1, P_2 = Initial and updated unit prices
#### Primary Forces Determining Demand
* **Consumer Desires:** Utility preferences, trends, and functional needs.
* **Consumer Income:** Available purchasing power and capital liquidity.
* **Substitute Prices:** Cost and accessibility of alternative choices.
* **Market Structure:** Population size, regional demographics, and competitive intensity.
### 1.11 Managerial Accounting
```
┌───────────────────────────────────────────┐
│ 4 CORE FUNCTIONS OF MANAGERIAL ACCT. │
└─────────────────────┬─────────────────────┘
│
┌────────────────┬───────────────────┼───────────────────┬────────────────┐
▼ ▼ ▼ ▼ ▼
┌──────────────┐ ┌──────────────┐ ┌─────────────────────┐ ┌──────────────────────┐
│ 1. PLANNING │ │ 2. CONTROL │ │ 3. DECIDING │ │ 4. PAST PERFORMANCE │
├──────────────┤ ├──────────────┤ ├─────────────────────┤ ├──────────────────────┤
│ • Master │ │ • Standard │ │ • Programmed Data │ │ • Multi-period │
│ Budgets │ │ Costing │ │ Collection │ │ Comparisons │
│ • Sales │ │ • Variance │ │ • Non-Programmed │ │ • Trend & Financial │
│ Forecasts │ │ Analysis │ │ Ad-Hoc Analysis │ │ Ratio Analysis │
│ • Production │ │ • Responsibility│ • Incremental Cost │ │ • Fund Flow & │
│ Schedules │ │ Accounting │ │ Evaluations │ │ Cash Flow Analysis │
└──────────────┘ └──────────────┘ └─────────────────────┘ └──────────────────────┘
```
## Chapter 2: Production and Productivity
### 2.1 Production Basics
**Production** is any intentional transformation process that converts targeted input factors into defined value-added outputs.
```
INPUT FACTORS OUTPUT FACTORS
┌─────────────────────────┐ ┌────────────────────┐
│ • Nature (Land/Resources)│ │ • Finished Products│
│ • Labour (Human Effort) │ ─── [ Transformation Process ] ──►│ (Tangibles) │
│ • Capital (Machinery) │ │ • Services │
│ • Enterprise (Management)│ │ (Intangibles) │
└─────────────────────────┘ └────────────────────┘
```
### 2.2 The Production Function
Mathematical representation of maximum possible output given a set of technological inputs:
*Where:*
* y = Total production output yield.
* c_1, c_2, \dots, c_n = Quantities of various input factors (e.g., labor, capital, materials).
#### Technological Evolution
1. **Industrial Revolution:** Shift from artisan handcrafting to steam-driven mechanical power.
2. **Mechanization Era:** Standardized machine setups and specialized power tooling.
3. **Scientific Management (1880s+):** Introduction of systematic work design, timing, and standardization.
4. **Modern Automation Era:**
* **Detroit Automation:** Advanced mechanical transfer lines and automatic part handling.
* **Feedback Control Systems:** Closed-loop automated adjustments using sensors and servomechanisms.
* **Computer Technology:** Computer Numerical Control (CNC), Flexible Manufacturing Systems (FMS), and Computer Integrated Manufacturing (CIM).
### 2.3 The Production System
```
┌──────────────────────────────────────────────┐
│ THE BUSINESS FIRM │
│ ┌────────────────────────────────────────┐ │
│ │ PRODUCTION SYSTEM │ │
│ │ │ │
Inputs ─────────► │ │ Inputs ─► Process ─► Inspect ─► Output │ │ ─────────► Outputs
(Raw Value) │ │ │ │ (Added Value)
│ └────────────────────────────────────────┘ │
└──────────────────────────────────────────────┘
```
#### Structural Analysis of Production Systems
| Evaluation Factor | Jobbing (Job Shop) | Batch Production | Mass Production | Continuous Process |
|---|---|---|---|---|
| **Equipment Type** | Standardized, general-purpose machines. | General-purpose plus specialized jigs/fixtures. | Highly specialized, single-purpose machinery. | Dedicated, fully automated production plants. |
| **Facility Layout** | Process / Functional layout. | Process layout with cellular family groupings. | Product / Line layout. | Process-driven continuous flow design. |
| **Product Flow** | Intermittent, complex, variable paths. | Intermittent, batch-by-batch progression. | Smooth, constant line movement. | Uninterrupted, fully automated fluid/part flow. |
| **Unit Product Cost** | Very High. | Medium. | Small. | Very Small. |
| **Work-in-Progress (WIP)** | Extremely High. | Medium. | Small. | Minimal / Theoretically zero. |
| **Representative Examples** | Shipbuilding, custom civil construction. | Machine tools, high-end furniture. | Automobiles, consumer electronics. | Oil refineries, chemical synthesis plants. |
### 2.4 The Input-Output Model
```
┌──────────────┐ ┌──────────────────────────────┐ ┌──────────────┐
│ INPUTS │ ─────► │ TRANSFORMATION PROCESSES │ ─────► │ OUTPUTS │
└──────────────┘ └──────────────────────────────┘ └──────────────┘
│
▼
┌──────────────────────────────┐
│ SYSTEM EFFICIENCY │
│ Physical: Output / Input = 1 │
│ Economic: Output / Input > 1 │
└──────────────────────────────┘
```
### 2.5 Micro-Economics Applied to Manufacturing Plants
* **Positive Approach:** Explains, describes, and models how operational systems function.
* **Normative Approach:** Prescribes specific policies and practices to achieve optimal output.
```
┌─────────────────────────────────────────┐
│ PLANT DECISION GOALS │
└────────────────────┬────────────────────┘
│
┌───────────────────┬─────────────┴─────┬───────────────────┐
▼ ▼ ▼ ▼
┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐
│ 1. INVENTORY │ │ 2. PRODUCTION │ │ 3. MARKETING │ │ 4. FINANCIAL │
├─────────────────┤ ├─────────────────┤ ├─────────────────┤ ├─────────────────┤
│ Balance holding │ │ Stable workforce│ │ Expand market │ │ Maximize overall│
│ vs. stockout │ │ low unit production│ share; strategic│ │ net profit & ROI│
│ costs. │ │ costs. │ │ pricing. │ │ │
└─────────────────┘ └─────────────────┘ └─────────────────┘ └─────────────────┘
```
#### Core Industrial Decision Domains
1. **Resource Allocation:** Optimizing machine loading, routing sequences, and detailed shop scheduling.
2. **Queuing Problems:** Balancing machine and station capacity against waiting time costs.
3. **Inventory Problems:** Establishing optimal order quantities and buffer safety stock levels.
4. **Pricing Problems:** Balancing market elasticity, profit margins, and cost structures.
5. **Investment Problems:** Evaluating capital equipment selection, line additions, and plant expansion.
### 2.6 Productivity Mechanics
Productivity measures how effectively resources are converted into finished outputs:
#### Quantitative Example
* **Operational Inputs:** 10 Direct Line Workers.
* **Operational Outputs:** 200 Finished Units per shift.
* **Labor Productivity Calculation:**
#### Stakeholder Benefits of High Productivity
```
PRODUCTIVITY GAINS
│
┌───────────────────────────┼───────────────────────────┐
▼ ▼ ▼
┌───────────────────┐ ┌───────────────────┐ ┌───────────────────┐
│ MANAGEMENT │ │ WORKERS │ │ CUSTOMERS │
├───────────────────┤ ├───────────────────┤ ├───────────────────┤
│ • Higher Margins │ │ • Higher Wages │ │ • Lower Prices │
│ • Strong Market │ │ • Better Working │ │ • Superior Product│
│ Position │ │ Conditions │ │ Quality │
│ • Debt Paydown │ │ • Greater Job │ │ • Consistent │
│ Capacity │ │ Security │ │ Availability │
└───────────────────┘ └───────────────────┘ └───────────────────┘
```
### 2.7 Factors Affecting Productivity
```
PRODUCTIVITY FACTORS
│
┌──────────────────────────┴──────────────────────────┐
▼ ▼
Macro-National Level Micro-Plant Level
────────────────────────── ───────────────────
• Human Resources & Education • Product & System Design
• Capital Investment & R&D • Machine Capabilities & Technology
• Regulatory Environment • Worker Skill & Engagement Levels
• Infrastructure Quality • Production Scale & Plant Layout
```
### 2.8 Techniques for Increasing Productivity
```
PRODUCTIVITY ENHANCEMENTS
│
┌──────────────────┬──────────────┴───────┬──────────────────┐
▼ ▼ ▼ ▼
┌─────────┐ ┌─────────┐ ┌─────────┐ ┌─────────┐
│ MATERIAL│ │ LABOUR │ │ PLANT & │ │ LAND & │
│SAVINGS │ │ EFFORT │ │ EQUIPMENT│ │BUILDINGS│
└────┬────┘ └────┬────┘ └────┬────┘ └────┬────┘
│ │ │ │
├─► Scrap reduction├─► Motion study ├─► Setup reduction├─► Optimized layout
├─► Value eng. ├─► Ergonomic tools ├─► Preventive maint.├─► Cubic utilization
└─► Proper storage └─► Method study └─► Tooling upgrades └─► Better lighting
```
### 2.9 Productivity Metrics and Data Sources
#### Primary Productivity Partial Measures
#### Key Operational Data Sources
1. **Product Identification Data:** Bills of Materials (BOM), engineering drawings, design specs.
2. **Accounting Data:** Job costing sheets, ledger entries, payroll logs, invoice registers.
3. **Work Measurement Data:** Time study standard sheets, synthetic time tables, delay sampling notes.
## Chapter 3: Organization
### 3.1 Concept of Organization
An **Organization** is the process of identifying and grouping tasks, defining and delegating authority and responsibility, and establishing operational relationships to enable people to work together effectively toward common goals.
#### Core Objectives
* Define roles, duties, and operational boundaries.
* Demarcate explicit lines of authority and legal responsibility.
* Establish reliable communication channels across organizational levels.
* Coordinate disparate operational departments toward unified business goals.
### 3.2 Importance of Organization
> *"Take away our factories, trade, transportation, and money — leave nothing but our organization, and in four years we shall have re-established ourselves."*
> — **Andrew Carnegie**
>
#### Organizational Benefits
1. **Facilitates Administration:** Eliminates task overlap and structural confusion.
2. **Supports Growth and Diversification:** Enables seamless scaling through modular expansion.
3. **Stimulates Creativity:** Clear operational roles allow employees to innovate within their domains.
4. **Optimizes Resource Utilization:** Prevents structural duplication of efforts and tools.
5. **Promotes Specialization:** Groups related skills into specialized functional centers.
6. **Minimizes Inefficiencies:** Promotes clear accountability and performance standards.
7. **Facilitates Executive Development:** Provides clear career pathways and management training.
### 3.3 Core Characteristics of an Organization
```
CHARACTERISTICS
│
┌────────────────────────────┼────────────────────────────┐
▼ ▼ ▼
Group of People Executive Leadership Unified Goals
(Unified workforce) (Direction & oversight) (Common objectives)
│ │ │
▼ ▼ ▼
Division of Labor Authority Framework Dynamic Interaction
(Functional roles) (Delegation chains) (Adapts to environment)
```
### 3.4 Essential Elements of an Organization
1. **Defined Objectives:** Clear short-term targets and long-term corporate goals.
2. **Coordinated Group:** Harmonious working relationships across teams.
3. **Division of Work:** Distributing operational tasks based on specialized skills.
4. **Clear Policies and Procedures:** Standardized operational frameworks.
5. **Defined Authority & Responsibility:** Explicit reporting structures and decision rights.
6. **Effective Communication Systems:** Clear flow of formal and informal information.
### 3.5 The Organizing Process
```
Step 1: Determine Objectives ──► Define target outcomes and corporate mission.
Step 2: Identify Activities ──► Break goals into functional operational tasks.
Step 3: Group Activities ──► Aggregate similar tasks into departments.
Step 4: Assign Duties ──► Assign specific roles to qualified personnel.
Step 5: Delegate Authority ──► Grant necessary decision-making power.
Step 6: Provide Resources ──► Supply workspace, tools, and budget allocations.
```
### 3.6 Organization Theories
```
ORGANIZATION THEORIES
│
┌──────────────────────────────┼──────────────────────────────┐
▼ ▼ ▼
Classical Theory Neo-Classical Theory Modern Systems Theory
(Mechanistic Focus) (Human Relations Focus) (Dynamic Systems Focus)
──────────────────── ──────────────────────── ───────────────────────
• Task Specialization • Social Systems & Norms • Contingency Approach
• Scalar Reporting Chains • Informal Group Dynamics • Multi-Variable Analysis
• Closed-System Assumption • Employee Motivation • Open-System Interaction
```
#### Detailed Theory Breakdown
```
Classical Theory: Structure-Focused, Mechanistic, Rules-Based
└── Pillars: Division of Labor, Scalar Chain, Strict Hierarchy, Narrow Span of Control.
└── Weakness: Neglects social dynamics, non-monetary motivators, and flexible adaptation.
Neo-Classical Theory: Human-Centric, Social Dynamics, Behavioral Emphasis
└── Pillars: Informal Group Networks, Employee Motivation, Participative Leadership.
└── Weakness: Lacks systemic operational structure; can overemphasize social satisfaction over output.
Modern Systems Theory: Dynamic, Contingency-Driven, Open-System Perspective
└── Pillars: Subsystem Interdependence, Environmental Feedback, Multi-Motivated Behavior.
└── Advantage: Integrates structural alignment with behavioral adaptability.
```
### 3.7 Principles of Organization
```
┌─────────────────────────────────────────────────────────────────────────────┐
│ CORE ORGANIZATIONAL PRINCIPLES │
├──────────────────────┬──────────────────────────────┬───────────────────────┤
│ Objective Alignment │ Functional Responsibility │ Span of Control │
│ Tasks must align directly │ Authority must strictly │ Optimal reporting │
│ with company goals. │ match delegated duties. │ range (4–8 direct). │
├──────────────────────┼──────────────────────────────┼───────────────────────┤
│ Line-Staff Balance │ Delegation Chains │ Two-Way Communication │
│ Clear distinction between│ Direct, uninterrupted reporting│ Clear, accessible │
│ core & advisory roles.│ paths. │ information flow. │
└──────────────────────┴──────────────────────────────┴───────────────────────┘
```
#### Determinants of Span of Control Width
* **Subordinate Skill Level:** Highly trained staff allow for a broader span of control.
* **Task Complexity:** Complex, variable work requires a narrower span of control.
* **Process Standardization:** Highly standardized operations enable broader spans.
* **Executive Capacity:** Managerial skill directly impacts reporting bandwidth.
* **Administrative Support:** Dedicated assistants allow managers to support larger teams.
### 3.8 Organizational Structure Dimensions
```
Vertical Dimension (Hierarchy & Scalar Chains)
▲ [Executive Level: Strategic Vision]
│ [Middle Management: Operational Tactical Translation]
│ [Shop-Floor Leadership: Direct Supervisory Execution]
▼
Horizontal Dimension (Departmentation & Functional Grouping)
◄── [R&D] ─── [Engineering] ─── [Production] ─── [Quality] ─── [Sales] ──►
```
### 3.9 Organization Charts & Manuals
#### Organization Chart
A visual representation showing structural relationships, reporting lines, and operational hierarchies.
```
[ GENERAL MANAGER ]
│
┌───────────────────────────┴───────────────────────────┐
▼ ▼
[ PRODUCTION MANAGER ] [ QUALITY MANAGER ]
│ │
├─► [Assembly Supervisor] ├─► [Metrology Lead]
└─► [Machining Supervisor] └─► [Nondestructive Testing]
```
* **Advantages:** Clarifies operational hierarchies, highlights task omissions, aids onboarding.
* **Limitations:** Provides a static snapshot, omits informal networks, requires regular updates.
#### Organization Manual
A detailed document outlining operational policies, job descriptions, delegated authorities, and departmental procedures.
* **Policy Manual:** Establishes strategic guidelines and corporate boundaries.
* **Operations Manual:** Details standard operating procedures (SOPs) and technical workflows.
* **Departmental Manual:** Defines internal procedures for specific operational units.
### 3.10 Types of Formal Organization Structures
```
1. Line / Military Structure
[Manager] ──► [Supervisor] ──► [Operator]
• Streamlined direct command path.
• Fast decision-making, strict discipline.
• Risk: Executive overload and lack of technical specialization.
2. Functional Structure (Taylor)
[Disciplinarian] [Gang Boss] [Speed Boss] [Inspector] ...
• Specialized supervision across functional domains.
• High functional expertise.
• Risk: Conflicts with unity of command; worker confusion with multiple bosses.
3. Line & Staff Structure
[Line Manager] ◄──── [Staff Specialist / Advisory Expert]
│
▼
[Line Operator]
• Combines direct line command with specialist advisory support.
• Balances operational speed with technical depth.
• Risk: Advisory staff may infringe on direct line authority.
```
#### Taylor's Eight Functional Foremen
```
[ PLANT SUPERINTENDENT ]
│
┌─────────────────────────────┴─────────────────────────────┐
▼ ▼
OFFICE FUNCTIONAL FOREMEN SHOP FUNCTIONAL FOREMEN
──────────────────────────────── ─────────────────────────
• Route Clerk (Work ordering) • Gang Boss (Setup preparation)
• Instruction Card Clerk (Specs) • Speed Boss (Cutting tools/speeds)
• Time and Cost Clerk (Accounting) • Repair Boss (Machine maintenance)
• Shop Disciplinarian (Personnel) • Inspector (Quality standards)
│ │
└─────────────────────────────┬─────────────────────────────┘
▼
[ SHOP WORKERS ]
```
### 3.11 Committees
Group-based decision bodies that pool cross-functional expertise to resolve operational challenges.
```
COMMITTEE TYPES
│
┌─────────────────┬──────────────┼──────────────┬─────────────────┐
▼ ▼ ▼ ▼ ▼
Standing / Perm. Temporary Executive Advisory Educational
(Ongoing issues) (Ad-hoc task) (Direct control)(Guidance only) (Knowledge sharing)
```
* **Advantages:** Combines diverse expertise, promotes cross-departmental buy-in, aids executive training.
* **Limitations:** Slow decision-making, potential for costly compromises, lacks individual accountability.
### 3.12 Project Organization
A temporary structure designed to deliver complex, customized outcomes within strict cost and time constraints.
```
[ CORPORATE EXECUTIVE ]
│
┌────────────────────────────┴────────────────────────────┐
▼ ▼
[ TRADITIONAL OPERATIONS ] [ PROJECT MANAGER ]
│
┌───────────────────────┼───────────────────────┐
▼ ▼ ▼
[Lead Systems Eng.] [Procurement Specialist] [Testing Engineer]
```
* **When Required:** One-off, highly technical projects with strict deadlines and resource budgets.
* **Advantages:** Dedicated project focus without disrupting routine plant operations.
* **Limitations:** Resource duplication, team anxiety regarding post-project reassignment.
### 3.13 Matrix Organization
A hybrid structure overlaying project teams onto a traditional functional hierarchy.
```
FUNCTIONAL HEADS
│ │
▼ ▼
[Engineering] [Production]
│ │
Project Manager A ────►[ Eng. A ] [ Prod. A ] ◄── Dual Reporting Matrix
│ │
Project Manager B ────►[ Eng. B ] [ Prod. B ]
```
* **Advantages:** Flexible resource allocation across projects; maintains functional development.
* **Limitations:** Violates unity of command; creates potential authority conflicts between managers.
### 3.14 Informal Organization
A network of personal relationships and social ties that naturally emerges within formal work environments.
```
INFORMAL GROUPS
│
┌────────────────────────┼────────────────────────┐
▼ ▼ ▼
Positive Impacts Potential Risks Managerial Strategy
───────────────── ───────────────── ───────────────────
• Rapid communication • Spreads rumors • Identify natural leaders
• Social support network • Resists change • Leverage informal channels
• High team cohesion • Low output norms • Align goals with company values
```
### 3.15 Departmentation Methods
```
DEPARTMENTATION
│
┌─────────────────┬───────────────┼───────────────┬─────────────────┐
▼ ▼ ▼ ▼ ▼
By Function By Product By Customer By Territory By Process
(Engineering, (Autonomous (B2B, Retail, (North, South, (Lathe, Welding,
Manufacturing) product lines) Government) International) Assembly)
```
### 3.16 Matching People to Jobs
Aligning employee capabilities with job requirements to optimize performance and job satisfaction.
```
JOB REQUIREMENTS CANDIDATE CAPABILITIES
┌─────────────────┐ ┌───────────────────────┐
│ • Task Demands │ │ • Knowledge & Degrees │
│ • Technical Skill│ ◄── Must Balance ──► │ • Practical Experience│
│ • Tooling Needs │ │ • Soft Skills │
└─────────────────┘ └───────────────────────┘
│
▼
┌───────────────────────┐
│ MASLOW'S HIERARCHY │
├───────────────────────┤
│ Self-Actualization │
│ Esteem Needs │
│ Belonging Needs │
│ Safety Needs │
│ Physiological Needs │
└───────────────────────┘
```
### 3.17 Authority Frameworks
#### Types of Managerial Authority
```
1. Rational-Legal Authority
└── Derived from formal corporate policy, position descriptions, and contractual rights.
2. Traditional Authority
└── Based on long-standing corporate customs, family ownership, or organizational history.
3. Charismatic Authority
└── Driven by exceptional personal qualities, leadership charisma, and individual influence.
```
### 3.18 Delegation of Authority
The process of assigning responsibility, granting corresponding authority, and creating accountability.
```
THE DELEGATION TRIAD
│
┌─────────────────────────┼─────────────────────────┐
▼ ▼ ▼
Responsibility Authority Accountability
(Assigning tasks) (Granting decision power)(Obligation to deliver)
```
*Note: Authority can be delegated, but ultimate managerial responsibility cannot.*
#### Key Delegation Barriers
```
Management Obstacles:
├── Perfectionist mindset ("I can do it better myself").
├── Fear of exposing personal limitations.
└── Lack of confidence in subordinate capabilities.
Subordinate Obstacles:
├── Fear of criticism or blame for errors.
├── Overburdened with existing operational duties.
└── Lack of necessary tools or decision support.
```
### 3.19 Delegation vs. Decentralization
```
DELEGATION DECENTRALIZATION
│ │
├─ Individual relationship ├─ Organization-wide structural policy
├─ Manager to subordinate ├─ Pushed down through all levels
└─ Specific operational tasks └─ Systematic decision-making autonomy
```
### 3.20 Group Dynamics
The social processes and interactions through which people operate in small groups.
```
GROUP INTERACTION
│
┌─────────────────────────┴─────────────────────────┐
▼ ▼
Formal Task Groups Informal Coalitions
(Committees, Project Teams) (Social Groups, Peer Alliances)
│ │
└─────────────────────────┬─────────────────────────┘
▼
Operational Impact Factors
├── Performance Norms
├── Resistance to Change
└── Safety Net Support
```
### 3.21 Organizational Change Dynamics
#### Lewin’s Three-Step Change Model
```
┌────────────────────────┐ ┌────────────────────────┐ ┌────────────────────────┐
│ 1. UNFREEZE │ ───► │ 2. CHANGE │ ───► │ 3. REFREEZE │
├────────────────────────┤ ├────────────────────────┤ ├────────────────────────┤
│ • Highlight defects in │ │ • Implement new systems│ │ • Institutionalize │
│ current workflows. │ │ and habits. │ │ new habits. │
│ • Reduce resistance. │ │ • Coach and mentor. │ │ • Reward performance. │
└────────────────────────┘ └────────────────────────┘ └────────────────────────┘
```
#### Individual and Organizational Resistance
```
Individual Drivers:
├── Economic: Fear of skill obsolescence or reduced pay.
└── Personal: Comfort with the status quo; fear of the unknown.
Organizational Drivers:
├── Structural Inertia: Established routines and legacy systems.
└── Threat to Power: Fear of shifting authority or budgets.
```
### 3.22 Organization Development (OD)
A long-term strategy to improve an organization’s problem-solving and renewal processes through collaborative culture management.
```
THE OD PROCESS
│
Step 1: Diagnosis ───────► Identify core operational issues and root causes.
Step 2: Strategy Planning ─► Design targeted intervention programs.
Step 3: Implementation ──► Execute planned organizational changes.
Step 4: Evaluation ─────► Measure outcomes against strategic targets.
```
#### OD vs. Management Development
| Aspect | Organization Development (OD) | Management Development |
|---|---|---|
| **Focus** | Whole organization design and cultural alignment. | Individual managerial skills and technical capabilities. |
| **Approach** | Systems-wide behavioral interventions. | Structured courses, training, and educational programs. |
| **Time Horizon** | Long-term strategic initiatives (3–5 years). | Short-to-medium-term skill acquisition. |
### 3.23 Organizational Conflict
#### Conflict Evolution Stages
```
Latent Conflict ──► Perceived ──► Felt Conflict ──► Manifest Conflict ──► Aftermath
(Conditions exist) (Awareness) (Emotional stress) (Open disagreement) (Resolution state)
```
#### Conflict Management Modes
* **Problem-Solving:** Collaborative engagement to find win-win solutions.
* **Persuasion & Mediation:** Using neutral third parties to align conflicting views.
* **Bargaining:** Negotiating trade-offs to reach an acceptable compromise.
* **Structural Redesign:** Clarifying reporting lines and resource allocations.
### 3.24 Managerial Leadership
#### Leadership Styles Spectrum
```
BOSS-CENTERED LEADERSHIP SUBORDINATE-CENTERED
(Autocratic / Authority-Driven) (Democratic / Participative)
◄───────────────────────────────────────────────────────────────────────────────►
[Manager Makes] [Manager Sells] [Manager Presents] [Manager Defines] [Team Operates]
[Decision Alone] [The Decision] [Ideas & Invites] [Limits & Asks] [With Complete]
[Questions] [Team To Decide] [Autonomy]
```
## Chapter 4: Plant Location, Layout, and Line Balancing
### 4.1 Factors Governing Plant Location
```
LOCATION DRIVERS
│
┌──────────────────────┬────────┴──────────────┬──────────────────────┐
▼ ▼ ▼ ▼
Resource Proximity Logistics Infrastructure Human Factors Site Conditions
────────────────── ──────────────────────── ───────────── ───────────────
• Raw materials • Rail & highway access • Skilled labor pool • Utility rates
• Customer markets • Ports & airways • Prevailing wages • Land costs
• Specialized vendors • Transport costs • Local regulations • Tax incentives
```
### 4.2 Locational Economics
#### Rate of Return Metric
### 4.3 Rural vs. Urban Plant Locations
| Evaluation Factor | Urban Plant Location | Rural Plant Location |
|---|---|---|
| **Transport Access** | High multi-modal connectivity. | Limited transit infrastructure. |
| **Labor Availability** | Immediate access to skilled labor pools. | Unskilled labor pool requiring training. |
| **Land Costs** | High cost per square meter. | Low land cost; scalable site options. |
| **Expansion Capability** | Highly constrained by adjacent builds. | Flexible layout expansion options. |
| **Local Taxes & Fees** | High municipal taxes and fees. | Favorable regional tax incentives. |
### 4.4 Plant Layout
The physical arrangement of industrial facilities, machinery, and support services to optimize material handling, safety, and operational flow.
```
LAYOUT OBJECTIVES
│
┌──────────────────┬──────────┴──────────┬──────────────────┐
▼ ▼ ▼ ▼
Minimize Handling Eliminate Congestion Maximize Space Use Ensure Flexibility
(Short paths) (Smooth flow paths) (Cubic volume) (Adaptable layout)
```
#### Core Layout Principles
1. **Principle of Integration:** Harmonizing equipment, labor, and support services.
2. **Principle of Minimum Distance:** Minimizing total material and worker travel path length.
3. **Principle of Flow:** Maintaining continuous movement without backtracking or delays.
4. **Principle of Cubic Space Utilization:** Effectively utilizing vertical building space.
5. **Principle of Safety & Comfort:** Designing ergonomic, safe, and well-ventilated workspaces.
6. **Principle of Flexibility:** Designing layouts that easily adapt to future design changes.
### 4.5 Process Layout (Functional Layout)
Groups similar equipment and operations into centralized specialized departments.
```
┌──────────────────────┐ ┌──────────────────────┐ ┌──────────────────────┐
│ TURNING SECTION │ │ MILLING SECTION │ │ DRILLING SECTION │
│ [Lathe] [Lathe] │ │ [Mill] [Mill] │ │ [Drill] [Drill] │
│ [Lathe] [Lathe] │ │ [Mill] [Mill] │ │ [Drill] [Drill] │
└──────────────────────┘ └──────────────────────┘ └──────────────────────┘
```
* **Best Suited For:** Low-volume, high-variety production (Job Shops).
* **Advantages:** High machine utilization, operational flexibility, specialized supervision.
* **Disadvantages:** High Work-In-Progress (WIP), long travel distances, complex production control.
### 4.6 Product Layout (Line Layout)
Arranges machinery and workstations along the explicit sequence of production operations.
```
[Raw Stock] ──► [Turning] ──► [Milling] ──► [Drilling] ──► [Assembly] ──► [Finished Goods]
```
* **Best Suited For:** High-volume, standardized production (Mass Production).
* **Advantages:** Low material handling, short throughput time, simple production control.
* **Disadvantages:** Inflexible, line shutdowns if one machine fails, repetitive work.
### 4.7 Combination (Hybrid) Layout
Combines process layout departments with dedicated line layout sections for high-volume part families.
```
┌────────────────────────────────────────────────────────┐
│ PROCESS DEPARTMENTS (Low Volume Variants) │
│ [Lathes] [Grinders] [Heat Treating] │
└────────────────────────────────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────┐
│ DEDICATED PRODUCT LINES (High-Volume Subassemblies) │
│ [Step 1] ────► [Step 2] ────► [Step 3] ────► [Inspect]│
└────────────────────────────────────────────────────────┘
```
### 4.8 Fixed-Position Layout
The product remains in a fixed location while equipment, tooling, and labor are brought to the site.
```
[ Equipment & Tools ]
│
▼
[ Supplies ] ─────► ┌─────────────┐ ◄───── [ Direct Labor ]
│ PRODUCT │
│ (Ship, Dam) │
└─────────────┘
```
* **Applications:** Shipbuilding, aircraft manufacturing, heavy civil construction.
### 4.9 Material Flow Patterns
```
Line Flow (Straight-through flow path)
[In] ─────────────────────────────────────────────────────────► [Out]
L-Flow (Fits wide, short plant footprints)
[In] ────────────────┐
│
▼ [Out]
U-Flow (Shared entry/exit logistics docks)
[In] ────────────────┐
│
[Out] ───────────────┘
S-Flow (Zigzag path maximizing long processing runs)
[In] ──────────────┐
│
┌──────────────────┘
│
└──────────────────► [Out]
```
### 4.10 Workstation Design
Workstations must be ergonomically designed around worker clear zones, tooling reach, and safety parameters.
```
┌─────────────────────────────────────────────────────────────────┐
│ WORKSTATION CLEAR ZONE │
│ │
│ ┌────────────────┐ ┌─────────────────┐ ┌─────────┐ │
│ │ Incoming Stock │ │ Machine Center │ │ Fixture │ │
│ │ (Bin A) │ │ (Clear Path) │ │ Storage │ │
│ └────────────────┘ └─────────────────┘ └─────────┘ │
│ │ │
│ [ Worker Standing Area ] │
│ │ │
│ ┌────────────────┐ ┌─────────────────┐ ┌─────────┐ │
│ │ Finished Bins │ │ Emergency Stop │ │ Tooling │ │
│ │ (Bin B) │ │ Access Area │ │ Rack │ │
│ └────────────────┘ └─────────────────┘ └─────────┘ │
└─────────────────────────────────────────────────────────────────┘
```
### 4.11 Methods of Plant Layout Analysis
#### Process Flow Charts
Document the step-by-step sequence of operations, moves, delays, and inspections.
#### Travel Chart (From-To Matrix)
Quantifies movement volume between departments to minimize total material handling distance.
```
TO Dept A Dept B Dept C Dept D
FROM ┌─────────┬────────┬────────┬────────┐
Dept A│ - │ 50 │ 120 │ 0 │
Dept B│ 0 │ - │ 10 │ 80 │
Dept C│ 0 │ 0 │ - │ 200 │
Dept D│ 0 │ 0 │ 0 │ - │
└─────────┴────────┴────────┴────────┘
```
#### Layout Models
* **2D Templates:** Cardboard or digital scale cutouts used for fast spatial arrangement.
* **3D Scale Models:** Physical or digital CAD models used to evaluate vertical clearances, piping, and overhead cranes.
### 4.12 Storage Space Requirements
#### Key Storage Factors
* Physical size, unit weight, and environmental sensitivity of materials.
* Required stock volume and inventory turn frequency.
* Handling equipment access dimensions (forklifts, AGVs).
#### Aisle Width Specifications
* **Main Traffic Aisles:** 1.5\text{ to }3.0\text{ meters wide}.
* **Sub-Aisles (Personnel only):** Minimum 0.75\text{ meters wide}.
### 4.13 Plant Layout Procedure
```
Accumulate Data ──► Analyze Flow ──► Select Handling ──► Sketch Plots ──► Optimize Stations ──► Final Approval
(Volume/Process) (Chart paths) (Conveyors/AGVs) (Plot lines) (Ergonomics) (Master CAD)
```
### 4.14 Factory Building & Environment
#### Environmental Standards
```
Lighting Requirements:
├── Passageways / Corridors : 5 foot-candles
├── Rough Assembly Work : 15 foot-candles
├── Normal Bench Work : 50 foot-candles
└── Precision Fine Work : 200–1000 foot-candles
Noise Exposure Limits:
├── Hydraulic Press (1m) : ~130 dB
├── Pneumatic Riveter : ~128 dB
└── Automatic Lathe : ~98 dB
```
### 4.15 Line Balancing Mechanics
Line balancing distributes task workloads across sequential workstations to minimize idle time and eliminate bottlenecks.
```
PRECEDENCE DIAGRAM EXAMPLE
┌───► [Task B (3m)] ───┐
│ ▼
[Task A (5m)] ───────┼──────────────────► [Task D (4m)]
│ ▲
└───► [Task C (2m)] ───┘
```
#### Core Metrics
## Chapter 5: Product Design, Planning, and Development
### 5.1 Introduction to Product Design
Product design converts market needs into precise technical specifications, drawings, and functional designs.
```
IDEA SOURCES DESIGN PHASES
┌─────────────────────────┐ ┌─────────────────────────┐
│ • Customer Complaints │ │ • Form Design │
│ • Competitor Evaluation │ ──► [ Interdisciplinary ] ───► │ (Aesthetics, shape) │
│ • Internal R&D Insights │ Design Review │ • Functional Design │
└─────────────────────────┘ │ (Operating physics) │
└─────────────────────────┘
```
### 5.2 Effect of Design on Cost
```
PRODUCT COST BREAKDOWN
│
┌───────────────────────┼───────────────────────┐
▼ ▼ ▼
Direct Materials Direct Labor Manufacturing Overheads
(Raw stock selection) (Machining operations) (Tooling, utilities, plant)
```
#### Cost Reduction Through Design
* **Standardized Components:** Use off-the-shelf parts to lower procurement costs.
* **Part Consolidation:** Minimize part counts to reduce assembly and handling time.
* **Realistic Tolerances:** Avoid unnecessarily tight tolerances that increase machining costs.
* **Design for Manufacture (DFM):** Simplify geometries to minimize specialized machining operations.
### 5.3 Requirements of Good Product Design
```
GOOD PRODUCT DESIGN
│
┌────────────────────────┴────────────────────────┐
▼ ▼
Customer Satisfaction Business Viability
───────────────────── ──────────────────
• Functional Reliability • Economical Manufacturing
• Intuitive Ergonomics • Standardized Components
• Easy Maintenance Access • Short Assembly Cycles
• Aesthetic Appeal • Sustainable Profit Margins
```
### 5.4 Factors Affecting Product Design
1. **Technical Factors:** Operating parameters, thermal envelope, target service life, and maintenance access.
2. **Industrial Design Factors:** Visual aesthetics, brand identity, user ergonomics, and safety interfaces.
3. **Production-Economic Factors:** Material costs, process requirements, tooling budgets, and scrap rates.
### 5.5 Design by Imitation
Developing new products by adapting proven, successful market designs rather than pursuing novel innovation.
* **Advantages:** Lower initial R&D expenditure, reduced market risk, faster development cycles.
* **Strategic Note:** Imitators launch later than innovators, but can capture market share through cost optimization and refined features.
### 5.6 Design Specifications and Drawings
```
ENGINEERING DRAWING
│
┌─────────────────────────────┼─────────────────────────────┐
▼ ▼ ▼
Part Geometry Manufacturing Specs Title Block & Admin
───────────────── ─────────────────── ───────────────────
• Dimensions & Datum Base • Material Grade Spec • Component Part Number
• GD&T Tolerances • Surface Finish Finish • Drawing Revision Level
• Scale & Projection • Heat Treatment Specs • Approval Sign-offs
```
### 5.7 Product Planning
Evaluating product line options, features, and market trends to align offerings with company goals.
```
FEASIBILITY EVALUATION
│
┌──────────────────┬─────────┴────────┬──────────────────┐
▼ ▼ ▼ ▼
Technical Capability Market Potential Financial Viability Support Structure
(Technology stack) (Volume/share) (ROI/Recovery) (Maintenance levels)
```
#### Maintenance Levels Definitions
* **Organizational Maintenance:** On-site field maintenance limited to basic visual inspections, cleaning, and module swaps.
* **Intermediate Maintenance:** Regional shop support capable of detailed troubleshooting and major module repairs.
* **Depot Maintenance:** Factory-level support capable of complete overhauls, remanufacturing, and system recalibration.
### 5.8 Product Classification
```
1. Convenience Goods ──► Inexpensive, daily items purchased frequently (e.g., snacks, magazines).
2. Shopping Goods ──► Higher-value items compared across brands before purchase (e.g., appliances, cars).
3. Specialty Goods ──► Unique goods with strong brand loyalty requiring selective buying effort (e.g., luxury watches).
4. Industrial Goods ──► B2B capital machinery, raw materials, and subassemblies used in production.
```
### 5.9 Product Development Process
```
Idea Generation ──► Screening ──► Technical Evaluation ──► Market Testing ──► Production ──► Market Launch
```
### 5.10 Standardization, Simplification, and Specialization
```
VARIETY REDUCTION TRIAD
│
┌───────────────────────────┼───────────────────────────┐
▼ ▼ ▼
Standardization Simplification Specialization
(Unified component specs) (Eliminating line variants) (Dedicated process focus)
│ │ │
▼ ▼ ▼
• Lower Unit Costs • Reduced Inventory • High Skill Proficiency
• Interoperability • Less Machine Setups • Process Efficiency
• Easy Quality Control • Streamlined Operations • Lower Tooling Variance
```
### 5.11 Interchangeability and Fits
**Interchangeability** ensures any standardized part will assemble correctly with any mating component chosen at random.
```
CLEARANCE FIT
┌───────────────────────────┐
│ [ Hole Diameter ] │
│ ┌───────────────────┐ │
│ │ [ Shaft Diameter ]│ │
└───┴───────────────────┴───┘
Shaft diameter is ALWAYS smaller than Hole.
INTERFERENCE FIT
┌───────────────────────────┐
│ [ Shaft Diameter ] │
│ ┌───────────────────┐ │
│ │ [ Hole Diameter ] │ │
└───┴───────────────────┴───┘
Shaft diameter is ALWAYS larger than Hole.
TRANSITION FIT
┌───────────────────────────┐
│ [ Variable Overlap ] │
└───────────────────────────┘
Fit can yield either clearance or interference.
```
#### Tolerance Types
## Chapter 6: Process Planning and Group Technology
### 6.1 Concept of Process Planning
Process planning bridges product design and manufacturing by determining the systematic methods needed to produce parts economically.
```
Design Engineering ──► [ Process Planning ] ──► Shop-Floor Operations
(Drawings/Specs) (Routing / Operations) (Production/Assembly)
```
### 6.2 Process Planning Inputs and Outputs
```
INPUTS OUTPUTS
┌─────────────────────────┐ ┌──────────────────────┐
│ • CAD Part Drawings │ │ • Operations Sheet │
│ • Production Forecasts │ ──► [ Process Planning ] ──► │ • Machine Routings │
│ • Quality Specifications│ │ • Tooling Lists │
│ • Raw Material Specs │ │ • Standard Times │
└─────────────────────────┘ └──────────────────────┘
```
### 6.3 Process Planning Steps
```
Step 1: Drawing Analysis ──► Evaluate geometries, datum surfaces, and tolerances.
Step 2: Make-or-Buy Decision ──► Determine whether to make parts in-house or source externally.
Step 3: Process Selection ──► Choose optimal manufacturing methods.
Step 4: Machine Selection ──► Assign operations to specific machine tools.
Step 5: Tooling & Jigs ──► Specify necessary fixtures, cutting tools, and gauges.
Step 6: Operation Sequencing──► Establish optimal operation routes and sequences.
Step 7: Documentation ──► Prepare formal operation and route sheets.
```
### 6.4 Make-or-Buy Analysis
#### Financial Evaluation Example
* **Outsourcing Option:** Buy 100,000 units/year at \$8.50\text{ per unit}.
* **In-House Manufacturing Option:**
* Incremental Fixed Costs: \$50,000
* Direct Labor Additions: \$125,000
* Raw Material Costs: \$600,000
* Allocated Overhead Increase: \$60,000
* **Decision:** **Make in-house**, saving \$0.15\text{ per unit} (\$15,000\text{ annually}).
### 6.5 Machine Capacity Analysis
### 6.6 Process Analysis and Symbology
Standard ASME process charting symbols used to map operational flows:
### 6.7 Computer-Aided Process Planning (CAPP)
```
CAPP SYSTEMS
│
┌───────────────────────────┴───────────────────────────┐
▼ ▼
Variant CAPP Systems Generative CAPP Systems
(Retrieval-Based) (Rules-Based Synthesis)
─────────────────── ───────────────────────
• Standard plans retrieved using GT codes. • Plans generated automatically using design logic.
• Modified by process engineers for new parts. • Requires minimal human intervention.
• Best for established part families. • Best for complex, non-standard parts.
```
### 6.8 Group Technology (GT)
Group Technology organizes manufacturing operations by grouping similar parts into **part families** produced within dedicated machine cells.
```
TRADITIONAL FUNCTIONAL LAYOUT GROUP TECHNOLOGY CELLULAR LAYOUT
┌───────────┐ ┌───────────┐ ┌───────────┐ ┌───────────────────┐ ┌───────────────────┐
│ Lathes │ │ Mills │ │ Grinders │ │ Cell 1 (Gears) │ │ Cell 2 (Shafts) │
│ [L] [L] │ │ [M] [M] │ │ [G] [G] │ │ [L] ──► [M] ──►[G]│ │ [L] ──► [G] ──►[M]│
└───────────┘ └───────────┘ └───────────┘ └───────────────────┘ └───────────────────┘
Complex backtracking, high WIP inventory. Streamlined flow, minimal setup times.
```
#### Optiz Coding System
Uses a 5-digit primary geometric code plus a 4-digit supplementary code to classify parts:
## Chapter 7: Production Planning and Control (PPC)
### 7.1 Core Functions of PPC
```
PRE-PLANNING PHASES PLANNING PHASES EXECUTION PHASES
┌─────────────────────┐ ┌─────────────────────┐ ┌─────────────────────┐
│ • Forecasting │ │ • Process Routing │ │ • Dispatching │
│ • Order Analysis │ ─────► │ • Machine Loading │ ─────► │ • Progress Tracking │
│ • Product Design │ │ • Master Scheduling │ │ • Corrective Action │
└─────────────────────┘ └─────────────────────┘ └─────────────────────┘
```
### 7.2 Production Systems Categorization
```
1. Mass / Flow Production
└── Standardized products, continuous line flow, dedicated machinery, low unit costs.
2. Batch Production
└── Products made in lots, intermittent material flow, moderate equipment flexibility.
3. Job Order Production
└── Low-volume, custom products; general-purpose machines; highly skilled workforce.
```
### 7.3 Demand Forecasting Techniques
#### Quantitative Forecasting Formulas
*Where:*
* \alpha = Smoothing constant (0 \le \alpha \le 1).
* \alpha = \frac{2}{N + 1} for an equivalent N-period moving average.
#### Qualitative Forecasting Methods
* **Delphi Technique:** Anonymized, iterative expert questionnaires designed to reach consensus without bandwagon effects.
* **Sales Force Composite:** Aggregates field sales forecasts up through management levels.
* **Market Research Surveys:** Direct consumer polling used to forecast demand for new products.
## Quick Reference Formula Cheat Sheet
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