I've been having an issue measuring concentricity. Could someone explain best practices for checking concentricity between two holes/pins at opposite ends of a part? The parts very from 4" to 12". I can spin them on the datum on my V-Blocks and show them as basically perfect with an indicator (indicator/v-block has been certified), but when I run them on the CMM I show them as being out of tolerance by like.. 1mm~/0.040". I have no idea if I'm just setting up the feature wrong or what, any thoughts?
