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