I need to measure a dimension to the centerline of a radius, but the radius is 2" and only covers an arc of about 25 degrees. Measured on the optical comparator, the radius is nearly nominal, but on the CMM it measures 2.117". This throws my centerline over .100" out of position. How can I create a centerline from points on the radius using the nominal radius? Can I force PC-DMIS to best fit a 2" radius to points on the surface?
That has complicated written all over it. It does help in comprehending the reasoning behind the exponential error encountered. I take with a grain of salt the Walter M. Stites' contribution. I have no doubt the man very experienced and knowledgeable. However, as a former customer, I became tasked with refuting his programming results (we all make errors at some time or another) on more than one occasion.
