2. Definition
JIT 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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3. 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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4. 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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5. Contd…
Waste of Overproduction
Waste of Waiting
Waste of Transportation
Waste of Processing itself
Waste of Stocks
Waste of Motion
Waste of Making Defective Products
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6. Japanese Manufacturing Techniques
Produce what the customer desires
Produce products only at the rate the customer wants
them
Produce with perfect quality
Produce by methods that allow people to
develop
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7. • 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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8. 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
9. 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
10. 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
11. JIT Implementation Requirements: Design
Flow Process
Link operations
Balance workstation capacities
Redesign layout for optimum flow
Emphasize preventive maintenance
Reduce lot sizes
Reduce setup/changeover time
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12. JIT Implementation Requirements: Total
Quality Control
Worker responsibility
SQC in place
Enforce compliance
Fail-safe methods (poka-yoke)
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13. JIT Implementation Requirements: Work with
Vendors
Reduce lead times
Frequent deliveries
Project usage requirements
Clear Quality expectations
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14. JIT Implementation Requirements: Reduce
Inventory More
Look for other areas to reduced materials
Minimize Stores
Minimize Transit
Carousels
Conveyors
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15. 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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17. JIT in Services (Examples)
Organize Problem-Solving Groups
Upgrade Housekeeping
Upgrade Quality
Clarify Process Flows
Revise Equipment and Process Technologies
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