[Pe...] Posted June 27 Share Posted June 27 Hello, I have a curiosity about a measurement I was seeing. I probed a circle in a ring gage using the same stylii, adjusting the A angle on the head each time. Looking at the X and Y values, I got some results that I'm not sure what to make of. Setting X0 Y0 using the master probe, using a different probe to measure the same circle: A 90° X-.0006 Y-.0001 A0° X.0000 Y.0001 A-90° X.0003 Y.0002 A180° X.0000 Y.0004 On each of these circles the diameter measured same as my ring gage and the roundness was .00007 at worst, and this was done with a freshly fully requalified probe. Is this something to be concerned about? I would think a .0009 total difference in X and .0005 in Y seems a bit much. Link to comment Share on other sites More sharing options...
[Ri...] Posted June 28 Share Posted June 28 I brought this up in a post a while back for two CMM's with XTR Sensors. Recently we had an RDS sensor added to one of the CMM's, the RDS carried the same issue with slightly less error. These two CMM's are almost one years old. Link to comment Share on other sites More sharing options...
[Da...] Posted June 28 Share Posted June 28 What type of machine, what kind of sensor? Link to comment Share on other sites More sharing options...
[Pe...] Posted June 28 Author Share Posted June 28 Please sign in to view this quote. Using a Contura with XXT sensor Link to comment Share on other sites More sharing options...
[Da...] Posted June 28 Share Posted June 28 Please sign in to view this quote. Are you using the CAA correction for your probes? You could give the regular non CAA calibration a try. Use a high grade probe ball and clean everything very thoroughly. Use a very short stylus, too. You basically have to eliminate every source of measuring uncertainty. And also very important: Calibrate all the styli you need in one go. Link to comment Share on other sites More sharing options...
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