Geometric variations from specified dimensions and

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Unformatted text preview: . Geometric variations from specified dimensions and form always occur when parts are manufactured. Improvements in production systems only mean that the amounts of the variations become smaller, but their presence does not disappear. Clearances nearly always are the measures used to predict how consistently the relative motion will occur and also to ensure that parts will assemble together in a mass-production environment. But clearances, which are attributes of pairs of parts, must be converted to tolerances, which are attributes of individual parts and dimensions. It is this process that CAT is intended to fulfill, all the while being sensitive to the impact of manufacturability, interchangeability, and maintainability on parts and product being designed. To shorten the time from concept to market of a product, it has been increasingly important to take clearances and the tolerancing of manufacturing variations into consideration right from the beginning, at the stage of design. Hence, geometric models are defined that represent both the complete array of geometric variations possible during manufacture and also the influence of geometry on the function of individual parts and on assemblies of them...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.

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