Lecture 12-Chapter 14

Lecture 12-Chapter 14 - J ust-in-T ime Systems J ust-in-T...

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Just-in-Time Systems
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Just-in-Time Repetitive production system in which processing and movement of materials and goods occur just as they are needed, usually in small batches characteristic of lean production systems traditionally they have lower processing costs, fewer defects, greater flexibility, and are able to bring new or improved products to the markets more quickly
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Key Elements of JI T System High quality levels Production smoothing Low inventories Small lot sizes Quick low -cost setups Layout Preventive maintenance Multifunctional workers Cooperative spirit Few, reliable suppliers Pull System of moving goods Problem solving Continual improvement
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H igh Quality Levels JIT systems require high quality levels, the systems are geared to a smooth flow of work, the appearance of problems due to poor quality creates disruption in this flow Becomes imperative to avoid shutdowns, and quickly resolve problems when they occur Involves three part approach: Designing quality into the product and process Insist vendors provide high-quality materials Make workers responsible for producing goods of high quality
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Production Smoothing JIT production requires a smooth flow of goods through the system to achieve a meshing of the different operations and the movement of goods and materials from the supplier to the final output Activity must be carefully coordinated because there is very little slack
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Low I nventories JIT systems known for low inventories-of purchased parts and raw materials etc. .. Three important aspects of low inventories: Saving of space- warehouse space and space in work areas Inventories are buffers that tend to cover up recurring problems that are never resolved Major problems must have already been resolved, it is necessary to be able to deal quickly with problems when they do occur
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Small Lot Sizes Small lots moving through the system, in-process inventory is considerably less than with large lots When problems with quality occur, inspection and rework costs are less because there are fewer items in al lot to inspect and rework Small lots also permit greater flexibility in scheduling This flexibility enable JIT systems to respond more quickly to demand for output
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Small lots and changing product mixes require frequent setups
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Lecture 12-Chapter 14 - J ust-in-T ime Systems J ust-in-T...

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