When the straightness tolerance is applied to the axis of the feature by a relationship with the diameter dimension, RFS is implied unless otherwise specified, and the actual feature size plus the geometric tolerance can exceed the MMC perfect form envelope.

Question

Quizplus · Accepted Answer

When the straightness tolerance is applied to the axis of the feature by a relationship with the diameter dimension, RFS (Regardless of Feature Size) is implied unless otherwise specified, which means that the tolerance applies regardless of the actual size of the feature. Therefore, the actual feature size plus the geometric tolerance can exceed the MMC (Maximum Material Condition) perfect form envelope, resulting in a larger envelope than the feature itself.

When the Straightness Tolerance Is Applied to the Axis of the Feature