Odd probe qualification results

[[Da...]]

The probe here is a custom probe that we made out of Titanium (very low C.O.T.E., and light weight). There are 2 1.3mm probes on the one end of the extension block. After calibration one of the probes has a sigma of .000006"(right side) the other side has a sigma of .000018"(Left side). I tried re-calibrating (cleaning, checking tightness of all the joints, and calibrating the whole probe system for a second time) and got the same results. So, we tried switching the two 1.3mm probes. The results were the same. The probe on the left had the same sigma as before the switch. I then replaced both probes with completely different 1.3mm probes and got similar results.

At this point I was worried that we may have a problem with the head itself. I moved the probe system to a different machine. I got THE SAME RESULTS!!!!
at this point we decided that the error is small enough to ignore (for the part we are checking), but we would like to resolve this problem in the future.
(The probes reported rigidity of 22.3 and 22.5 respectively and the large probe on the other end reported 135.2). Total probe system weight is 325 grams.
This probe reduced the cycle time from 8.5-9 min. down to 6-7 min. It's a high production run and the reduced time helps our ongoing machine load issues!
Any theories or ideas?

[[Mi...]]

Have you tried removing the cylindrical extension and seeing the results?
Have you qualified the probes with Dyn tensor or tensor only? Force and % dynamic?

[[Mi...]]

We've run into this with some custom made holders. I always suspected it was the quality, and perpendicularity of the threads.

We don't make custom holders anymore, we get ITP to do it.