It may not be widely recognized that most of the inspection data supplied by inspection equipment, following the
practices of AGMA Standard 2015 and similar standards, are not of elemental accuracy deviations but of some form of composite deviations. This paper demonstrates the validity of this “composite” label by first defining the nature of a true
elemental deviation and then, by referring to earlier literature, demonstrating how the common inspection practices for involute, lead (on helical gears), pitch, and, in some cases, total accumulated pitch, constitute composite measurements.
This presentation is an expansion of a previous study (Ref.1) by the authors
on lapping effects on surface finish and transmission errors. It documents
the effects of the superfinishing process on hypoid gears, surface finish and transmission errors.