I brought a CAD model in and checked some nominals to make sure the origin was where I wanted it. After doing my alignments, I like to take some test points just to make sure that everything is good. When I went to do this today, I noticed that the CAD nominals changed.
For example. The part I am working has two bosses that are 1.85 inches up from the origin, which is the bottom of a flange. I aligned and zeroed to the bosses and then moved the 1.85 back to the origin. Now when I check the CAD nominals, one boss checks 1.849 and the other is 1.88 or something like that, and the bottom of the flange which was "0" now ranges from 0 to .030.
Why would the CAD nominals change?
