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?
There are a lot of times things can't be reduced to a single useful number. In your example, both ends are out of tolerance. (Rule 1, aka the Envelope Principle, aka dimensions apply the full length of the feature)
Hopefully, there is a space on the form for QC comments to fully explain what's going on.
There are a lot of times things can't be reduced to a single useful number. In your example, both ends are out of tolerance. (Rule 1, aka the Envelope Principle, aka dimensions apply the full length of the feature)
Hopefully, there is a space on the form for QC comments to fully explain what's going on.
