cad13992

It has to do with the LENGTH of the feature and which one is datum. You should be getting the lowest results when using the LONGEST feature as the datum. Think of it this way....

This example will NOT match exactly what you have, but will demonstrate the problem.

Take a paperplate. Put a 1/2" diameter pin in the middle of the plate. Now, if you call the plate the master and spin it centered on the pin, the pin will hardly wobble since the 'datum' is a big feature. Now, chuck on the pin and spin, the plate will flop all over the place because your 'master' is now the little pin.