Orientation Checks

Angularity, Perpendicularity and Parallelism

Orientation checks require at least a single datum for evaluation. The measurements of the datum are first aligned to the datum features and then the measurements of the check feature are evaluated rela- tive to that alignment.

Perpendicularity and Parallelism are special cases of an angularity check where the angle is either 90 or 0 degrees respectively and are therefore evaluated in the same way. Angularity checks ensure that all the specified points lie at approximately a specified angle relative to the datum features. The tolerance zone can be defined as planar region or as the deviation between two axes.

Evaluation Process within SA: