jit mod 5

PRODUCTION AND OPERATIONS

MANAGEMENT

Mod. 5JUST-IN-TIME

SYSTEMS

Himalaya Publishing HouseProduction and Operations ManagementBy K. Aswathappa & K. Shridhara Bhat

Chapter 24Just-in-Time Systems

What is a “Just-in-time System”?

• “Just-in-time”: A philosophy of manufacturing based on planned elimination of all waste and continuous improvement of productivity.



Concepts of JIT

The three fundamental concepts of JIT are :

1. Elimination of waste and variability

2. “Pull” versus “Push” system and

3. Manufacturing cycle time (or “throughput” time).



Overview of JIT manufacturing

Inventory reduction Quality improvement Lead time reduction Continuous Improvement Total Preventive Maintenance



Pre-requisites for JIT Manufacturing

1. Make the factories focussed.2. Improve product quality.3. Cross-train workers so that they are multi-skilled

and competent in several jobs.4. Reduce equipment break downs through

preventive maintenance.5. Develop long-term supplier relationships that

avoid interruptions in material flows.



Elements of JIT Manufacturing System

1. Eliminate waste

2. Enforced problem solving

3. Continuous improvement

4. Involvement of people

5. TQM



Benefits of JIT System

1. Low inventory levels

2. Shorter production cycle time

3. Improved product quality

4. Reduced WIP Inventory

5. Better labour utilisation.



Major Tools and Techniques of JIT Manufacturing

JIT has certain tactical tools.

The tactical tools of little JIT are :i. Kanban system or Pull scheduling

ii. Lean production

iii. Poka- Yoke (Fool proofing)

iv. Quality at the source



vi. Standardisation and simplification

vii. Supplier partnerships

viii. Reduced transaction processing and

ix. Kaizen (continuous improvement).

Kanban system:

A physical control system consisting of cards and containers. The system is used to signal the need for more parts and to ensure that those parts are produced in time to support subsequent fabrication or assembly.



Benefits of Kanban

Kanban systems have resulted in significant benefits :1. Reduced inventory level

2. Less confusion over sequence of activities

3. Less obsolescence of inventories while in storage

4. Smaller floor space requirements for storing inventory



The focus of JIT systems is on improving the process, therefore, some of the JIT concepts useful for the manufacturer are also useful to service providers. These concepts include the following :

1. Consistently high quality2. Uniform facility loads3. Standardised work methods4. Close supplier ties5. Flexible workforce 6. Automation7. Preventive maintenance

JIT in Services

jit mod 5

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