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INTRODUCTION TO PRODUCTION PLANNING AND CONTROL
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OBJECTIVES AND BENEFITS
Minimize costs / maximize profits Maximize customer service Minimize inventory investment Minimize changes in production rates Minimize changes in work-force levels Maximize the utilization of plant and equipment
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FUNCTIONS OF PRODUCTION CONTROL
Production function encompasses the activities of procurement, allocation and utilization of resources. The main objective of production function is to produce the goods and services demanded by the customers in the most efficient and economical way. Therefore efficient management of the production function is of utmost importance in order to achieve this objective.
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TYPES OF PRODUCTION Continuous production Job or unit production
Intermittent production
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CONTINUOUS PRODUCTION
It refers to the production of standardized products with a standard set of process and operation sequence in anticipation of demand. It is also known as mass flow production or assembly line production. This system ensures less work in process inventory and high product quality but involves large investment in machinery and equipment.
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JOB OR UNIT PRODUCTION It involves production as per customer‘s specification each batch or order consists of a small lot of identical products and is different from other batches. The system requires comparatively smaller investment in machines and equipment. It is flexible and can be adapted to changes in product design and order size without much inconvenience.
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INTERMITTENT PRODUCTION
Under this system the goods are produced partly for inventory and partly for customer's orders. E.g. components are made for inventory but they are combined differently for different customers. . Automobile plants, printing presses, electrical goods plant
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PRODUCT DESIGN Product design is a strategic decision as the image and profit earning capacity of a small firm depends largely on product design. Once the product to be produced is decided by the entrepreneur the next step is to prepare its design Product design consists of form and function. The form designing includes decisions regarding its shape, size, color and appearance of the product. The functional design involves the working conditions of the product.
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PRODUCT DEVELOPMENT (a) Standardization (b) Reliability (c) Maintainability (d) Servicing (e) Reproducibility (f) Sustainability (g) Product simplification (h) Quality Commensuration with cost (i) Product value (j) Consumer quality (k) Needs and tastes of consumers.
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MARKETING ASPECT Sales and Marketing is a key function whose participation is often hard to enlist. Sales and Marketing are critical functions in this process, since they provide the starting point of the planning and scheduling process ‑‑ the forecasts and customer order demands They are also vital from the viewpoint of providing the proper customer perspective whenever changes need to be made to plans and schedules based on mismatches of resources to customer demands. Only with a proper level of participation in Planning and Scheduling, can Sales and Marketing optimally leverage its performance and create a trusting and consensus‑based working relationship with Manufacturing, Purchasing, Planning, Engineering and all other functions in the company.
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FUNCTIONAL AND OPERATIONAL ASPECT
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DURABILITY AND DEPENDABILITY
Dependability for a system gathers the following attributes or non- functional requirements: Availability: readiness for correct service Reliability: continuity of correct service Maintainability: to undergo modifications and repairs Durability aspects concerns about the way the production is going to serve the purpose with out any hurdles for a prolonged period of time scale
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aesthetic and non aesthetic effect
AESTHETIC ASPECT Difference between aesthetic and non aesthetic effect
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PROFIT CONSIDERATION Taking the time to calculate the profit margin for a product line or even for a company as a whole is essential to determining if a company is growing, maintaining its current market share, or is losing customers and is in danger of not making a profit. Many companies choose to look at profit margin ratios on a regular basis, just to make sure that sales are headed in the right direction, and that expenses are being contained in order to maximize the returns from those sales.
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STANDARDIZATION Sizes for screws, nuts bolts and other threaded fasteners were first standardized based on work of by Joseph Whitworth.. Pipe sizes Shoe size standardization The screw base size and thread dimensions of electric lamp bulbs was standardized by Thomas Edison. Electrical voltage and frequency Electrical wiring and device standards
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SIMPLIFICATION AND SPECIALIZATION
The production system should be as simple as possible to make it easy for understanding as well as easy for execution Specialization of production infers the special production system for specific products or services.
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BREAK EVEN ANALYSIS The break-even chart is a graphical representation of costs at various levels of activity shown on the same chart as the variation of income (or sales, revenue) with the same variation in activity. The point at which neither profit nor loss is made is known as the "break-even point"
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ECONOMICS OF NEW DESIGN
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Product and Service Design
Major factors in design strategy Cost Quality Time-to-market Customer satisfaction Competitive advantage Product and service design – or redesign – should be closely tied to an organization’s strategy
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Product or Service Design Activities
Translate customer wants and needs into product and service requirements Refine existing products and services Develop new products and services Formulate quality goals Formulate cost targets Construct and test prototypes Document specifications
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Reasons for Product or Service Design
Economic Social and demographic Political, liability, or legal Competitive Cost or availability Technological
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Objectives of Product and Service Design
Main focus Customer satisfaction Understand what the customer wants Secondary focus Function of product/service Cost/profit Quality Appearance Ease of production/assembly Ease of maintenance/service
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Designing For Operations
Taking into account the capabilities of the organization in designing goods and services. Failure to take this into account can: Reduce productivity Reduce quality Increase costs
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Designers Adhere to Guidelines
Produce designs that are consistant with the goals of the company Give customers the value they expect Make health and safety a primary concern Consider potential harm to the environment
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Other Issues in Product and Service Design
Product/service life cycles How much standardization Mass customization Product/service reliability Robust design Degree of newness Cultural differences
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Life Cycles of Products or Services
Time Introduction Growth Maturity Saturation Decline Demand
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Standardization Standardization
Extent to which there is an absence of variety in a product, service or process Standardized products are immediately available to customers
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Advantages of Standardization
Fewer parts to deal with in inventory & manufacturing Design costs are generally lower Reduced training costs and time More routine purchasing, handling, and inspection procedures Quality is more consistent
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Advantages of Standardization (Cont’d)
Orders fillable from inventory Opportunities for long production runs and automation Need for fewer parts justifies increased expenditures on perfecting designs and improving quality control procedures.
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Disadvantages of Standardization
Designs may be frozen with too many imperfections remaining. High cost of design changes increases resistance to improvements. Decreased variety results in less consumer appeal.
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Modular Design Modular design is a form of standardization in which component parts are subdivided into modules that are easily replaced or interchanged. It allows: easier diagnosis and remedy of failures easier repair and replacement simplification of manufacturing and assembly
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Reliability Reliability: The ability of a product, part, or system to perform its intended function under a prescribed set of conditions Failure: Situation in which a product, part, or system does not perform as intended Normal operating conditions: The set of conditions under which an item’s reliability is specified
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Improving Reliability
Component design Production/assembly techniques Testing Redundancy/backup Preventive maintenance procedures User education System design
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Product Design Product Life Cycles Robust Design
Concurrent Engineering Computer-Aided Design Modular Design
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Robust Design Robust Design: Design that results in products or services that can function over a broad range of conditions
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Degree of Newness Modification of an existing product/service
Expansion of an existing product/service Clone of a competitor’s product/service New product/service
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Global Product Design Virtual teams
Uses combined efforts of a team of designers working in different countries Provides a range of comparative advantages over traditional teams such as: Engaging the best human resources around the world Possibly operating on a 24-hr basis Global customer needs assessment Global design can increase marketability
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Phases in Product Development Process
Idea generation Feasibility analysis Product specifications Process specifications Prototype development Design review Market test Product introduction Follow-up evaluation
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Idea Generation Supply chain based Competitor based Research based
Ideas Competitor based Research based
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Reverse Engineering Reverse engineering is the
dismantling and inspecting of a competitor’s product to discover product improvements.
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Research & Development (R&D)
Organized efforts to increase scientific knowledge or product innovation & may involve: Basic Research advances knowledge about a subject without near-term expectations of commercial applications. Applied Research achieves commercial applications. Development converts results of applied research into commercial applications.
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Manufacturability Manufacturability is the ease of fabrication and/or assembly which is important for: Cost Productivity Quality
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Remanufacturing Remanufacturing: Refurbishing used products by replacing worn-out or defective components. Remanufactured products can be sold for 50% of the cost of a new producer Remanufacturing can use unskilled labor Some governments require manufacturers to take back used products Design for Disassembly (DFD): Designing products so that they can be easily taken apart.
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Component Commonality
Multiple products or product families that have a high degree of similarity can share components Automakers using internal parts Engines and transmissions Water pumps Etc. Other benefits Reduced training for assemble and installation Reduced repair time and costs
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Service Design Service is an act Service delivery system
Facilities Processes Skills Many services are bundled with products
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Service Design Service design involves The physical resources needed
The goods that are purchased or consumed by the customer Explicit services Implicit services
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Service Design Service Service delivery system Product bundle
Something that is done to or for a customer Service delivery system The facilities, processes, and skills needed to provide a service Product bundle The combination of goods and services provided to a customer Service package The physical resources needed to perform the service
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Differences Between Product and Service Design
Tangible – intangible Services created and delivered at the same time Services cannot be inventoried Services highly visible to customers Services have low barrier to entry Location important to service Range of service systems Demand variability
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Service Systems Service systems range from those with little or no customer contact to very high degree of customer contact such as: Insulated technical core (software development) Production line (automatic car wash) Personalized service (hair cut, medical service) Consumer participation (diet program) Self service (supermarket)
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Phases in Service Design
Conceptualize Identify service package components Determine performance specifications Translate performance specifications into design specifications Translate design specifications into delivery specifications
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Operations Strategy Increase emphasis on component commonality
Package products and services Use multiple-use platforms Consider tactics for mass customization Look for continual improvement Shorten time to market
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Shorten Time to Market Use standardized components Use technology
Use concurrent engineering
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