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Datum Referencing.

09/26/2009

A datum indicates the origin of a dimensional relationship between a toleranced feature and a designated feature or features on a part. The designated feature serves as a datum feature, whereas its true geometric counterpart establishes the datum plane. Because measurements cannot be made from a true geometric counterpart,which is theoretical, a datum is assumed to exist in, and be simulated by the associated pro-cessing equipment.

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