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Manufacturing Handbook of Best Practices 2011 Part 12

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Tham khảo tài liệu 'manufacturing handbook of best practices 2011 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 12 Manufacturing Controls Integration R.T. Chris Christensen 12.1 THE BASIC PREMISE OF INVENTORY Ever since the pharaohs built the pyramids humans have been faced with the problem in production management of how inventory should be used to maintain balance and level load production. In the case of the pharaohs they needed to have a big pile of big rocks on hand to maintain a continuous production schedule. And since the time of the pharaohs we hadn t made any significant inroads into the pile-of-rocks theory of manufacturing and inventory control until 1959. That was when Joe Orlicky of IBM developed the matched sets of parts relationship required to get the right parts to the right job at the right time. He called it materials requirements planning MRP . Although we had the tool we had only a very limited application of MRP. Although the work required for processing information in an MRP environment is ideally suited for computer processing the limiting factor in the early 1960s was our limited and expensive computer power. The repetitive work required to process the information and do the calculations was cost prohibitive. This left us with finding the cheapest way to balance the matched sets of parts. We found the method necessary to minimize our manufacturing cost and called that tool inventory. Like the pharaohs we now have our pile of rocks the cheapest way to do it. From this point on in the development of manufacturing theory all we have really done is add tools to accomplish the task of controlling the matched sets of parts. The primary tool that we use is the computer so we can do the calculations needed to control our operations. As we continue to increase the level of computer involvement as our tool our processing time becomes cheaper than that pile of rocks. When computer power becomes cheaper than inventory we reduce inventory and add power. This new and cheaper information processing power has brought us to today where our goals are to run a quicker