production planning and control4
Post on 07-Nov-2015
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Example Contd
PPC Class Notes-Chapter1Example Contd
PPC Class Notes-Chapter1Example Contd
PPC Class Notes-Chapter1Example Contd
PPC Class Notes-Chapter1Planning vs. Control
PPC Class Notes-Chapter1RepetitiveMatching PPC with the Needs of the FirmFlowNumber ofSubparts Seconds Minutes Days Weeks Months Time between successive units Examples: Oil, food, drugs, watches, TV, trucks, planes, houses, shipsJust-in-TimeMRPCPM/PERTPPC Class Notes-Chapter1Matching PPC with the Needs of the FirmFlow-Oriented Manufacturing SystemsVery short time between successive unitsA few components neededFlow rate is the measureEx: Chemical, food, petroleumPPC Class Notes-Chapter1Matching PPC with the Needs of the Firm (Contd)2. Repetitive-Nature Manufacturing SystemsShort time between successive unitsAssemble similar productsFlow Rate or Assembly Rate is the measureEx: Televisions, Radios, Watches, Cars
PPC Class Notes-Chapter1Matching PPC with the Needs of the Firm (Contd)3. Just-in-TimeHigh production volumeLow Product VarietyReduced Inventory and LeadtimeEx: Cars, Computers, Jewelry, Copy Machines
PPC Class Notes-Chapter1Matching PPC with the Needs of the Firm (Contd)4. Materials Requirements Planning (MRP)Batch production High product varietyLow production quantity Ex: Electric Motors, Fans
PPC Class Notes-Chapter1Matching PPC with the Needs of the Firm (Contd)5. CPM/PERTLong leadtimes Low production quantity Ex: Airplanes, ships
PPC Class Notes-Chapter1Forces for ChangeTechnologyProductsProcessesSystemsTechniquesMarketplace dictates Company strategyManufacturing StrategyManufacturing processesMPC systemShorter Product Life CyclesTime Based CompetitionQuality RequirementsFlexibility/ResponsivenessReduced Overhead costsSimplificationAutomationProduction CellsMRPJITTypical ResponsesMaterials Planning:
Detailed material plans are prepared for subassemblies and parts to be manufactured; components and raw materials to be purchased.
Weeks
123456789101112
Gold3kg3kg2.5kg2.5kg
Silver5kg5kg4kg4kg
Red Stone3K2K3K2K
Plated parts5K5K5K5K
Capacity Requirements Planning:
Weeks
123456789101112
Manpower320310330322
Machine X52556057
Machine Y90929895
Machine Z178163172170
Purchasing:
Contact vendors, evaluate quotes and cut purchase orders.
Shop Floor Control:
Assign parts to be plated to different plating lines
Load manufacturing cells with products and determine start and completion times
Cell1Job1Job 3Job 7
Cell2Job 2Job 4
Cell3Job 5Job 8Job 6
0 5hr 7 10 22 25 34 38
planning
no
control
yes
Plans
OK?
Revise
Stop
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