Means This

Datum planĀ« A

(True geometric counterpart of datum feature A)

Datum planĀ« A

(True geometric counterpart of datum feature A)

Datum feature A

Datum feature A

Geometric Dimensioning And Tolerancing

Simulated datum feature (Surface of manufacturing or verification equipment)

Simulated datum piano A (Plane derived from the datum feature simulator)

Simulated datum feature (Surface of manufacturing or verification equipment)

(a) Workplece & datum feature simulator prior to contact

Datum Plane Simulator

Datum feature A

Workplece

Datum Feature Simulator

Simulated datum plane A (Plane derived from the datum feature simulator)

Datum plane A

(True geometric counterpart of datum feature A)

(b) Workplece & datum feature simulator In contact

FIG. 4-10 DATUM FEATURE. SIMULATED DATUM, AND THEORETICAL DATUM PLANE

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