If your CAD part has its z zero on the bottom, which coincides with the granite surface of the CMM, How do you take hits on that surface in DCC mode? In manual mode its simple to probe the granite around the part and call that z zero. Once you switch to DCC mode, I cant figure out a way to instruct the machine to take hits on a plane extended out from the part bottom. I have worked around this in the past by moving the z on the cad model but the part I am measuring now doesn't lend itself to that method. It is basically a large cone with no plane at the top. The part is too large to fixture on its side. Thanks in advance.
Thanks to everyone for their suggestions. I know the granite is not a calibrated surface but I am usually measuring core and cavity components from very old injection molds and the amount of corrosion, damage and undocumented rework that has happened over the years is way beyond the variation I would get from the granite. I like the idea of adding a second CAD part to act as the surface. I will try that next. Thanks again.
Thanks to everyone for their suggestions. I know the granite is not a calibrated surface but I am usually measuring core and cavity components from very old injection molds and the amount of corrosion, damage and undocumented rework that has happened over the years is way beyond the variation I would get from the granite. I like the idea of adding a second CAD part to act as the surface. I will try that next. Thanks again.
