We have a Cordax RS220 with a PH10MQ running Measure Max. The problem is there is up to .004 error in measurements taken at the 90X180 position on the PH10. For example, using the cal sphere as a test piece, measuring the sphere at 0X0 then setting it XYZ zero, then rotating to 90X180 at remeasuring the same location, and the X is Zero,Z is Zero, but Y is -.004? I then did the same test using the four 90 deg 90X0,90X90,90X-90,90X180, they all came up good but the 90X180. I then calibrated all then 180 rotation tips at the 7.5 deg inc., did the same test with the sphere, and I started seeing error at 52.5 deg(.002) and working its way up to .004 at 90. All of these test were done under DCC motion, so all manual error s/b eliminated. Then looking at the calibration numbers, the form on the tips >52.5 deg was high (up to .0025). I then did the same sphere test at the MEA location and the problem does not exist. It only occurs as you move away from the MEA location on the table, and not linear. I then called G&L tech, they suggested removing the PH10 and turning it around 180 , so the 180 would be 0. I recalibrated and did the same test again, thinking the error would then occur in the Y+ direction following the probe. But the error still occurs in the same Y- direction? I do not have another PH10 to swap it with to try it, and do not want to be out 4k for a RBE if it is not the problem. Any suggestions would be greatly appreciated.

Mike Sylvester
CMS Lead
The Aerostructures Corporation
Contour Aerospace Division