STRAIGHTNESS ON UNIT OF LENGTH BASIS

A straightness tolerance is applied in the view where the elements to be controlled are represented by a straight line. The tolerance zone of straightness is constrained into the plane of projection of the view where it is called.

It can deviate from the true surface orientation to adjust as closely as possible around the actual surface, minimising the distance that is required for the two parallel lines to enclose the linear elements on the surface.

For each linear element on the surface, the tolerance zone of straightness may be oriented differently, as long as it stays in the correct plane.