With a card exact quantity of good parts in each

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with a card EXACT quantity of GOOD parts in each container Never pass defective parts Do not exceed production or withdrawal quantities specified on the cards
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JIT Production/Operations Systems Characteristics of JIT (Lean Systems) Operations Pull Production system (material flow) Consistently high quality Small lot sizes Uniform workstation loads Standardization of components/ work methods Close supplier ties Flexible workforce Line flows Automated production Preventive maintenance
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JIT Production/Operations Systems (II) JIT is a system of enforced problem solving With no buffer inventories to reply on in times of production interruptions problems are highly visible and cannot be ignored The job of eliminating production problem is never finished Continuous improvement is a practice and central to the philosophy of JIT People make JIT work: JIT has a strong element of training and involvement of workers A culture of mutual trust and team work An attitude of loyalty and self-discipline Empowerment of workers giving them the authority to solve production problems
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Converting Traditional Shops Towards JIT What types of production more fit to JIT? JIT is ideal for repetitive manufacturing. However many efforts have been made to convert traditional job shops towards JIT shops by making no-repetitive production to repetitive production. How to measure JIT practice? In general, in converting traditional shops towards JIT, a 100% JIT shop is not attainable. Instead a measurement of how far toward JIT is desirable for MGT measuring JIT practice is a new topic in the POM field
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Converting Traditional Shops Towards JIT (II) Macro-measurement Reduction in average job flow time /inventory turnover/WIP Reduction in defective rate/scrap cost /product failure. Micro-measurement LP/PT ratio WP/WS ratio
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JIT Measures JIT is a manufacturing philosophy- not a technique. Ideally, JIT requires that materials/ sub-assemblies/ components be procured or produced in the necessary amounts. Just in time to be “consumed” by the subsequent stage in the process/ value chain. There are two important “micro measures” that can be used to determine whether a facility practices JIT. A: Lead Time divided by work content (or actual processing time). The ideal LT/PT ratio is of course 1.0- one hour of elapsed time to complete a job that requires one hour of machine processing. A more practical “ideal” ratio is 2.0, while a good ration is 2.5. A more typical ratio is 10, 20, or 100. B: Work Pieces in Process divided by Number of Workstations. An ideal ratio is once again 1.0. These ratio don’t tell the manager how to improve the process but do provide a target. Other considerations in evaluating Just In Time operations: Distance between machine operations Transfer lot (batch) sizes between machines Set up Times Machine Processing Time Variation Product Quality Vendor Reliability Material handling equipment
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Working Towards Repetitive
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