Parallelism between an axis and a plane
Hello all.
I have a part, for which Datum A is specified as the axis of a constructed cylinder between two ID features which are 23.75mm apart. This is our basic dimension for length of the axis.
Datum B is a plane constructed on two small pads, with the datum target points specified such that the constructed plane, for measurement purposes, is 10.5mm in lenght and 2.5mm in width.
The parallelism callout is for -B- to be parallel to -A- within .050mm.
One of our engineers says that since Datum A is X amount longer than Datum B, we must multiply the actual measured value of the parallelism by the ratio of -B-s length to -A-'s length, which is something like 2.25.
Does anyone else apply this type of factor when measauring parallelism of two features which are different lengths?
Thanks in advance.