When establishing a datum axis, where the surface is the primary datum feature, the diameter should be long.

Question

Quizplus · Accepted Answer

When establishing a datum axis where the surface is the primary datum feature, the focus is on the flatness or straightness of the surface rather than the length of a diameter. The datum axis is defined by the orientation and location of the surface, not by the length of any cylindrical feature.

When Establishing a Datum Axis, Where the Surface Is the Primary