Not necessarily CMM related. Lets say I have a part with an OD with a size callout of Ø1.500 +0.001/-0.000 and the surface has a taper of about 0.002 over the length of the part. At the one end it measures 1.4997 and at the other end it measures 1.5012. How do you report the size of the dimension?
Not to muddy the water to much and not an answer to the question, surely you would expect there to be a tolerance for parallelism as well to constrain the dia within an envelope therefore highlighting an out of tolerance if tapered
Not to muddy the water to much and not an answer to the question, surely you would expect there to be a tolerance for parallelism as well to constrain the dia within an envelope therefore highlighting an out of tolerance if tapered