just in time
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TRANSCRIPT
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DefinitionJIT is a manufacturing system whose goal is
to optimize processes and procedure by continuously pursuing waste reduction
It is both a philosophy and a set of methods for manufacturing. Although it has no single, agreed-upon definition ,JIT emphasizes waste reduction, total quality control, and devotion to the customer.
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Evolution of JIT The history of Japan since world war II is
the history of a developing economy, especially manufacturing. The Japanese economy was also ruined and faced the challenge of transition from wartime to a peacetime economy with very resources. This scarcity of resources was a key factor in the evolution of the Just-In-Time philosophy.
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The Seven Wastages Shigeo Shingo, a recognized JIT
authority and engineer at the Toyota Motor Company identifies seven wastes as being the targets of continuous improvement in production process. By attending to these wastes, improvement is achieved.
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Contd…Waste of OverproductionWaste of WaitingWaste of TransportationWaste of Processing itselfWaste of StocksWaste of MotionWaste of Making Defective Products
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Japanese Manufacturing TechniquesProduce what the customer desiresProduce products only at the rate the
customer wants themProduce with perfect qualityProduce by methods that allow people to develop
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• Produce with no waste of labour, material, or equipment; every move has a purpose so there is zero idle inventory • Produce instantaneously – with zero unnecessary lead time
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Minimizing Waste: Group Technology (Part 1)
• Using Departmental Specialization for plant layout can cause a lot of unnecessary material movement
• Using Departmental Specialization for plant layout can cause a lot of unnecessary material movement
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Saw Saw
Lathe PressPress
Grinder
LatheLathe
Saw
Press
Heat Treat
Grinder
Note how the flow lines are going back and forthNote how the flow lines are going back and forth
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Minimizing Waste: Group Technology (Part 2)
• Revising by using Group Technology Cells can reduce movement and improve product flow
• Revising by using Group Technology Cells can reduce movement and improve product flow
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Press
Lathe
Grinder
Grinder
A
2
BSaw
Heat Treat
LatheSaw Lathe
PressLathe
1
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Minimizing Waste: Just-In-Time
Production
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• Management philosophy• “Pull” system though the plant• Hydraulic Push Systems
WHAT IT IS
• Employee participation• Industrial engineering/basics• Continuing improvement• Total quality control• Small lot sizes
WHAT IT REQUIRES
• Attacks waste• Exposes problems and bottlenecks• Achieves streamlined production
WHAT IT DOES
• Stable environment
WHAT IT ASSUMES
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JIT Implementation Requirements: Design Flow ProcessLink operations
Balance workstation capacities
Redesign layout for optimum flow
Emphasize preventive maintenance
Reduce lot sizes
Reduce setup/changeover time
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JIT Implementation Requirements: Total Quality Control
Worker responsibility
SQC in place
Enforce compliance
Fail-safe methods (poka-yoke)
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JIT Implementation Requirements: Work with Vendors
Reduce lead times
Frequent deliveries
Project usage requirements
Clear Quality expectations
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JIT Implementation Requirements: Reduce Inventory MoreLook for other areas to reduced materials
Minimize Stores
Minimize Transit
Carousels
Conveyors
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JIT Implementation Requirements: Improve Product Design
Standard produce configuration
Standardize and reduce number of parts
Align Process design with product design
Quality expectations
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JIT Implementation Requirements: Measure Performance
Emphasize improvement
Track trends
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JIT in Services (Examples)
Organize Problem-Solving Groups
Upgrade Housekeeping
Upgrade Quality
Clarify Process Flows
Revise Equipment and Process Technologies
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JIT in Services (Examples)
Level the Facility Load
Eliminate Unnecessary Activities
Reorganize Physical Configuration
Introduce Demand-Pull Scheduling
Develop Supplier Networks
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