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1 Chapter 11 Planning Production Activity. 2 Advanced Organizer.

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Presentation on theme: "1 Chapter 11 Planning Production Activity. 2 Advanced Organizer."— Presentation transcript:

1 1 Chapter 11 Planning Production Activity

2 2 Advanced Organizer

3 3 Chapter Objectives Describe position of engineer in the production process Describe considerations in planning manufacturing facilities Be able to use production planning tools Recognize different methods for production planning and control

4 4 Engineers in Production Activity Plant Manager –Engineering design –Maintenance –Utilities, Security Production Manager –Production Planning –Routing –Scheduling –Dispatching & Follow-up Quality Manager –Quality Control –Inspection Industrial Eng. Manager –Methods –Time Study –Standards General Superintendent Director of Purchasing Finance Manager Ind. Relations Manager

5 5 Future Demands on Manufacturing Engineers An environment of exploding scope (Product Complexity, Global Manuf., Social & Eco. changes) Multiple roles (Op. Integrator, Manuf. Strategist) Advanced tools (Computer hardware, database, CAD/CAM, Decision Support Systems) Changed work emphasis (Team<>Individual, Human<>Technical, Outside<>Inside Services)

6 6 Planning Manufacturing Facilities Area selection Community selection Site selection Common errors

7 7 Area Selection Location of markets Location of materials Transportation facilities (Hwy, Rail, Air, Port) Labor supply (Supply, Skill, Wage, Union) Location of other plants and warehouses

8 8 Community Selection Managerial preferences Community facilities Community attitudes Community, government and taxation Financial inducements

9 9 Site Selection Size of site Topography Utilities Waste Disposal Transportation facilities Land costs, Zoning, Expansion

10 10 Common Errors in Facility Location Analysis Labor cost miscalculations Inadequate labor reservoir Lack of distribution outlets Underestimated importance of taxes Purchasing unsuitable building

11 11 Objectives of Plant Layout Planning Minimize materials-handling costs Reduce congestion of personnel & material Increase safety of personnel Increase labor efficiency Improve morale Facilitate communication and coordination Provide operations flexibility Increase quality of working life Fung shui

12 12 Plant Layout Alternatives Product layout Process layout Group Technology

13 13 Product Layout Line Balancing Materials Handling

14 14 Process (Functional) Layout

15 15 Group Technology (Cellular) Layout

16 16 Quantitative Tools in Production Planning Inventory control Break-even charts Learning curves

17 17 Inventory Control Basic Economic Ordering Quantity Model Quantity Time Q Let I = Carrying cost R = Annual demand S = Ordering cost

18 18 Break-even charts Order Quantity Q $ Carrying Cost = I(Q/2) EOQ Ordering Cost = S(R/Q) Total Annual Cost Inventory Control Basic Economic Ordering Quantity Model

19 19 Inventory Control Backlog Inventory Model Quantity Time Q

20 20 Inventory Control Production Inventory Model Quantity Time Q

21 21 Inventory Control Inventory with Safety Stock Model Quantity Time Q

22 22 Lean Manufacturing considers inventory a waste Just-In-Time requires lot size of 1 Key: Reducing ordering (setup) costs Problems with EOQ Analysis

23 23 Break-even Analysis: Fixed Costs and Variable Costs Fixed Costs: constant, independent of the output or activity level. –Property taxes, insurance –Management and administrative salaries –License fees, and interest costs on borrowed capital –Rental or lease Variable Costs: Proportional to the output or activity level. –Direct labor cost –Direct materials

24 24 Break-even Analysis Total Variable Cost = Unit Variable Cost * Quantity TVC = VC * Q Total Cost = Fixed Cost + Total Variable Cost TC = FC + VC * Q Total Revenue = Unit Selling Price * Quantity TR = SP * Q where TVC = Total variable cost VC = Variable cost per unit Q = Production/Selling quantity FC = fixed costs TR = Total Revenue SP = Selling price per unit

25 25 Break-even Analysis Break-even point: the output level at which total revenue is equal to total cost. SP * BEP = FC + VC * BEP BEP = FC / (SP - VC) where BEP = breakeven point FC = fixed costs SP = selling price per unit VC = variable cost per unit Applications of Break-even Analysis: –Determining minimum production quantity –Forecast production profit / loss

26 26 Break-even Analysis Production Quantity $ Break-even Point Fixed Costs Variable Costs Total Costs Total Revenue Loss Profit

27 27 Break-even Analysis Break-even Point $ Production Quantity Total Costs Total Revenue Maximum Profit

28 28 Learning Curves Learning Curves: Production time reduces by a constant rate as production quantity doubles Let Y 1 = Time to perform the 1 st unit Y n = Time to perform the n th unit b = Constant based on learning curve rate k% n = Number of completed units

29 29 Learning Curves Linear Regression is used to estimate –b and Y 1 when Multiple (m) data points are available

30 30 Learning Curves Cumulative production time from N 1 to N 2 :

31 31 Learning Curve Example

32 32 Example 2-9 Cost Estimating using Learning Curve nYnYn nYnYn Learning Curve Example

33 33 Example 2-9 Cost Estimating using Learning Curve Normal Scale Log-Log Scale Learning Curve Example

34 34 Production Planning & Control Planning, Coordination, Control Concerns: production quantity, costs, quality, due dates, efficiency Irregularities: machine break down, scrapped parts, late arrival, rush orders, design changes Idle resources <> Idle inventory

35 35 Steps in Production Planning Identify the goals (inventory level) Process planning (routing) Loading Scheduling Dispatching (execution) Production control

36 36 Materials Requirements Planning (MRP) Main Features: Planning tool geared specifically to assembly operations. MRP was created to tackle the problem of 'dependent demand'; determining how many of a particular component is required knowing the number of finished products. It allows each manufacturing unit to tell its supplier what parts it requires and when it requires them. The supplier may be the upstream process within the plant or an outside supplier.

37 37 Materials Requirements Planning (MRP) Master Production Schedule (MPS): mix of known demand, forecasts and product to be made for finished stock. Exploding: Using the Bill of Materials (BOM), MRP determines how many, of what components, are needed for each item (part, sub assembly, final assembly, finished product) of manufacture. –BOMs are characterized by the number of levels involved, following the structure of assemblies and sub assemblies. –The first level is represented by the MPS and is 'exploded' down to final assembly. Netting: any stock on hand is subtracted from the gross requirement Offsetting: determines when manufacturing should start so that the finished items are available when required. –Lead time has to be assumed for the operation.

38 38 Materials Requirements Planning (MRP) Major assumptions with MRP schedule: There is sufficient capacity available. For this reason MRP is sometimes called infinite capacity scheduling. The lead times are known, or can be estimated, in advance. the date the order is required can be used as the starting date from which to develop the schedule.

39 39 Manufacturing Resource Planning (MRP II) Feedback: feedback from the shop floor on how the work has progressed, to all levels of the schedule so that the next run can be updated on a regular basis. Resource Scheduling: scheduling capability of the resources Batching Rules –'Lot for Lot' means batches that match the orders. –Economic Batch Quantity (EBQ) is calculated to minimize the cost through balancing the set up cost against the cost of stock. –'Part Period Cover' means making batches whose size cover a fixed period of demand. Software Extensions –Rough Cut Capacity Planning (RCCP), an initial attempt to match the order load to the capacity available, –Sales Order Processing –Cost accounting Data Accuracy

40 40 Enterprise Resource Planning (ERP) ERP is a way to integrate the data and processes of an organization into one single system. Ideal ERP System –Manufacturing: engineering, capacity, workflow management, quality control, bills of material, manufacturing process, etc. –Financials: Accounts payable, accounts receivable, fixed assets, general ledger and cash management, etc. –Human Resources: Benefits, training, payroll, time and attendance, etc –Supply Chain Management: Inventory, supply chain planning, supplier scheduling, claim processing, order entry, purchasing, etc. –Projects: Costing, billing, activity management, time and expense, etc. –Customer Relationship Management: sales and marketing, service, commissions, customer contact, calls center support, etc. –Data Warehouse

41 41 Enterprise Resource Planning (ERP) Advantages of ERP Systems A totally integrated system The ability to streamline different processes and workflows The ability to easily share data across various departments in an organization Improved efficiency and productivity levels Better tracking and forecasting Lower costs Improved customer service

42 42 Enterprise Resource Planning (ERP) Disadvantages of ERP Systems Success does depend on skills and the experience of the workforce to quickly adapt to the new system Customization in many situations is limited The need to reengineer business processes ERP systems can be cost prohibitive to install and run Technical support can be shoddy ERP's may be too rigid for specific organizations that are either new or want to move in a new direction in the near future

43 43 Production Planning & Control Systems Synchronized manufacturing (OPT) –looks for bottlenecks

44 44 Toyota Production System Just-in-Time "Just-in-Time" means making only "what is needed, when it is needed, and in the amount needed." Supplying "what is needed, when it is needed, and in the amount needed" according to this production plan can eliminate waste, inconsistencies, and unreasonable requirements, resulting in improved productivity. Kanban System In the TPS, a unique production control method called the "kanban system" plays an important role. The kanban system has also been called the "Supermarket method" because the idea behind it was borrowed from supermarkets.

45 45 JIT Kanban System Store Preceding Station Succeeding Station Actual Parts P Production-ordering Kanban W Withdrawal Kanban

46 46 JIT Kanban System Store Preceding Station Succeeding Station P

47 47 JIT Kanban System Store Preceding Station Succeeding Station P

48 48 JIT Kanban System Store Preceding Station P Succeeding Station W

49 49 JIT Kanban System Store Preceding Station P Succeeding Station W

50 50 JIT Kanban System Store Preceding Station P Succeeding Station W

51 51 Toyota Production System

52 52 Lean Manufacturing Lean means "manufacturing without waste." Waste ("muda" in Japanese) has many forms. Material, time, idle equipment, and inventory are examples. Most waste is invisible. Nor is elimination easy. Lean Manufacturing improves material handling, inventory, quality, scheduling, personnel and customer satisfaction.

53 53 Lean Manufacturing Core Disciplines Cellular Manufacturing Pull Scheduling (Kanban) Six Sigma/Total Quality Management Rapid Setup Team Development Tools Value Stream Mapping and Process Mapping are two valuable tools that can help eliminate waste and streamline work. Group Technology can sort out workflow in complex product mixes.

54 54 Flexible Manufacturing Systems (FMS) Basic categories: Stand-alone machine Flexible manufacturing cell (FMC) –> one machine + pallet changing equipment Flexible manufacturing system (FMS) –workstations + matls handling sys. + comp. control Fully automated factory (FAF)

55 55 Flexible Manufacturing Systems (FMS) Benefits: Greater productivity Improved quality Increased reliability of production Reduced batch size & lead-time Increased % of time spent on machine tools

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