Which of the following feature controls must have a datum reference?
A)flatness
B)straightness
C) cylindricity
D) parallelism

Question

Quizplus · Accepted Answer

Parallelism must have a datum reference because it is a geometric tolerance that controls the parallelism between two surfaces or features in relation to a specified datum. Flatness, straightness, and cylindricity are form tolerances that do not require a datum reference as they are intrinsic to the feature itself.

Which of the Following Feature Controls Must Have a Datum