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Metric Standards for Worldwide Manufacturing 2007


Metric Standards for Worldwide Manufacturing - 2007 Electronic 7th Edition by Knut O. Kverneland

The change to the metric system offers North American manufacturing unique opportunities to introduce new thinking to the old ways products were made. The metric system requires new fastener sizes, new material stock sizes, new cutting tools, new gages, etc., to be used in production. This is where tremendously rewarding opportunities come into play. For example, 11 or less threaded fastener sizes may be selected to replace more than 50 sizes used in the old systems (see Table 8-1). Multiply the number of unique fastener sizes that can be eliminated by several thousand dollars each (automotive actual savings), and the total dollar savings for your company can very well become quite impressive. The selection of metric material and components must be based on existing international and national metric standards. Therefore, in providing a foundation for this volume, the author has compared standards in the eight largest industrial countries of the world, which together produce the majority of the worlds products. The preferred numbering system, coupled with the preferred metric sizes, preferred metric tolerances for holes (4) and shafts (4), and the preferred fits (10) (see Table 6-1), is another powerful tool available to you. This highly integrated ISO tolerancing system has been in use in the European continent for 60 years, where it has saved industry there millions, if not billions, of dollars in reduced costs in manufacturing, engineering, purchasing, and inspection. Among other things, this volume is also one of the most powerful rationalization tools available (see Table 4-1). It is now up to the reader to make the rationalized selection of standard parts and components listed in this book that will return the most benefits. The motto the author supports is ôSELL AMERICANö rather than the negative promotion we frequently hear. ôBUY AMERICAN.ö

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