I am trying to inspect a part where the critical dimension is a hole in the middle with a diameter of 25.476mm (+0.01/-0), and it also has a 0.01mm cylindricity callout. When I inspect the hole as a cylinder, both the UAME and Local sizes are reporting out of tolerance, however when I inspect the same hole as multiple circles at different depths, all of the circles are in tolerance. Instead of using the auto cylinder function, I also tried to create a construction cylinder out of those circles and still got the same result. The cylindricity itself is in tolerance, as well as the runout, so I'm not exactly sure what I am doing wrong, and what i can do to correct this. I am relatively new to CMM programming, so any advice is appreciated.
I would use a bore gage for the diameter as I don't trust a CMM to give an accurate diameter at anything smaller than +/-.005. I would only use the location (and form data only with enough hits.)
I would use a bore gage for the diameter as I don't trust a CMM to give an accurate diameter at anything smaller than +/-.005. I would only use the location (and form data only with enough hits.)
What I don't understand though, is why the diameter is repeatedly in tolerance when reported through the "Location" feature but incorrect when reported through the "size" feature using GD&T? Shouldn't they be the same?