The following chapter presents geospelling the first

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Unformatted text preview: nd are characterized by contradictions. Today, dimensional and geometric tolerances are expressed with graphical symbols on a 2D drawing. These symbols are defined in different national and international standards. The main existing ISO standards for tolerancing isolated parts, ISO 8015 (1985), ISO 1101(1983), ISO 2692 (1988) and ISO 5459(1981) are not recent and have a lot of gaps and contradictions [Bennich, 1993]. Also, these standards do not cover the need to express geometric requirements on assembly and does not consider statistical aspects. After the creation within ISO organization of Geometrical Product Specification (GPS) committee in 1996, a lot of work has been accomplished, but today, the most useful standards are unfortunately always the same. Probably, in a very near future, engineers may hope to have new ISO standards. This situation put a very important brake on engineering progress. 2.2. A complete tolerancing process To be complete, the tolerancing process has to cover all the aspects of geometric variations during the product life cycle. It must in...
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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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