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Belanger said:...paragraph 7.24.9, which states: "When a datum target area or datum target line is shown on a nonplanar surface, the shape of the datum target’s true geometric counterpart is the same as the basic shape of the surface."
3DDave said:If the datum target area is a complex compound curved surface then it is reasonable to expect the matching tooling to be the same.
Nescius said:Of course, it sometimes would be reasonable to match the tooling to the basic shape of the part in the area of contact. However, mandating this is very limiting. A primitive thing can serve perfectly well as a locating stop against a non-primitive surface, even more so when it's serving as a secondary or tertiary restraint.