Hard to understand, but there is a push in a certain 150 emp company with ±2000 ring gages from 1/2 inch to 18" wants to "calibrate" our ring gages on a 15 year old B&S Global. These have always been sent to the lab until we merged this year. Actually were sending "x" and above out, but ZZ and Z are now to be done on CMM. CMM calibrated by B&S Techs. Anyone know with relative certainty and have data on the accuracy of a CMM taking 30 touch points on 3 to 6" ZZ, Z or even X ring gages? How bad could it be? I would like to properly argue against this practice.