Talk:Geometric dimensioning and tolerancing

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The most interesting aspect to the topic Geometric Dimensioning and Tolerancing (aka GD&T) is that the document most often refered to as basis, ASME Y14.5M-1994, has no definition for Geometric Dimensioning. The Document title is "Dimensioning and Tolerancing."

The term GD&T is likely the outgrowth of a major proponent, Lowell Foster, who wrote introductory texts called Geometrics, but it is just as likely a marketing term developed by one of the huge number of trainer/consultants in the field of 'Y14.5 application. In the scope of the standard, it is slang.

Geometric tolerancing is defined (paraphrased) as applying to variations part surfaces and derived features, such as axes.

All that aside, the underlying value of the standard is to provide a set of common terminology, and reference methods.

[edit] ISO Equivalent

I was wanting to know if there is an ISO document that covers what the ASME Y14.5 document has. any help here would be great.

[edit] re: ISO Equivalent

The ISO breaks the concepts contained in 'Y14.5 into a number of smaller documents. ISO 2692-1998 covers MMC principles. Unless it's been replaced, the root document is now ISO 1101:2004. See http://www.iso.org/iso/en/CatalogueListPage.CatalogueList?COMMID=4647&scopelist=

Lothartklein 07:00, 22 June 2007 (UTC): There is not only a single ISO standards but a whole bunch of them and at least 3 ISO committees are producing GD&T standards (TC10, TC213, TC184) from different perspectives (drawing, product, CAD exchange). I added a few but there are several more for specific areas.