Fig Part Where Datum Features Are Plane Surfaces

FIED, DIMENSIONS ARE RELATED TO DATUM A (PRIMARY), DATUM B (SECONDARY), AND DATUM C (TERTIARY). This note is not to be used in lieu of indicating datum rcfereaces in a feature control frame for geometric tolerancing applications.

4.4.1 Positioning Parts With Plana Surface Datum Features on Datum Reference Frame.

Figure 4-3 illustrates the sequence for positioning the part shown in Fig. 4-2 on a datum reference frame that is simulated by the processing equipment. Where a surface is specified as a datum feature without qualification, a high point or points anywhere on the entire surface must contact the datum plane. The pri-

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