Technical Drawing for Product Design by Stefano Tornincasa

Author:Stefano Tornincasa
Language: eng
Format: epub
ISBN: 9783030608545
Publisher: Springer International Publishing

The complementary indication >< is only used to lock the orientation degrees of freedom, and not the location, and should be omitted when the geometrical characteristic only controls the orientation of the feature (e.g. a perpendicular specification).

In Fig. 6.69, for example, the task of locating the tolerance zone has passed from datum B to datum A. Datum B only controls the orientation (that is, it only restricts two degrees of freedom instead of three).

Fig. 6.69Example of a datum with the >< modifier. Datum B should orientate and locate the tolerance zone (constrained by three degrees of freedom). The use of the “><” modifier only allows the orientation to be controlled, while the location of the tolerance zone is left to datum A

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