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When To Not Use GD&T
Sometimes people attempt to use GD&T for things that it was not meant to handle.  Below are some examples of situations in which GD&T should not be used
Non Part Features - GD&T is meant to be used on part features.  It should not be used on things that are not part features. For instance, sometimes it is desirable for assembly reasons to mark a part by scribing a line or by using a paint dot.  Such things are not part features.  They cannot be located or oriented with GD&T
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Another subject that is not part of GD&T is surface finish.    Surface finish is an important subject in itself but just not part of GD&T.
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