In the work I do I have the ability to suggest and facilitate print changes. A lot the prints we deal with are from the early seventies. I've seen some of the prints in the history file, that have since been changed, that say "file to fit". We've come a long way since then though. The two items I come across are either a design engineer going G.D.& T. happy or misapplied tolerancing. The case I have in mind is one that I would like some opinion on. The CMM I use includes software that calculates ISO standards 1101 with set datums and dimensional tolerances.
Question #1. What is the standard way of calculating run out if the part can't be checked in standard way. (That is rotating it on the datum to check the feature that is specified.)
Question #2. Is total run out the best or most practical way to control the position of two holes so that they line up?