Datums are off inside programs (All out in same direction)

Have you calibrated the probe tips and rechecked? That would be strange indeed unless someone smacked the origin tooling ball and didn't inform you. If you're using the same probe angle to check the TB and the datums, that would be even stranger.

The issue did start after a calibration. I will re calibrate my tips and try again I guess. I cant think of anything else that would be causing an issue like this. Thanks

Hello all,

I seem to be running into a problem with my 2way and 4way checks inside my programs. All of a sudden 2 fixtures in a row are showing an offset on my 4way and 2way 0.5mm in the same direction.
For Example I pick up the tooling balls come back check 2 way and 4way and both fixtures show they are out 0.5 mm in same direction (Machine axis). Does this make any sense ? could it be a bent probe that could be causing this issue ? I'm not sure whats going on here.

I have had this issue while using an SP25 probe system. Sometimes the styli holders don't sit right in the module - the little balls of the kinematic coupling don't line up with the grooves. This makes the probe assembly about 0.5mm longer than it should be.

More than once I have had the probe pick up the stylus holder wrong (slightly rotated), successfully calibrate the probe all while it is seated wrong, then put the probe away in the probe rack in a manner that fixes the orientation (A little V shaped notch in the probe rack can automatically fix slight rotation errors). After that the probe is picked up correctly and all the measurements are shifted by half a mm along the vector of the probe module. It can make for some really confusing measurement errors if you use lots of different probe angles.

I often wish the SP25 probe could detect this problem by using a proximity switch, check conductivity across the balls, or something.

This may not be your exact problem, especially if you use a different probe system, but it may be similar.

We only use the one Probe Setup TP20,100,20,20x2mm. I made sure everything is tight in the probe assembly and just finished calibrating my tips again. Time to see if this changed anything. After Calibrating my tip angles I checked back on the Master Sphere by calling it 0,0,0 and measuring different tips along different axis. Something isn't adding up here

Try deleting and rebuilding the probe in pcdmis if it fails again.

Ya I'm not having any luck. I don't understand how I can pick up multiple fixtures and the 2way and 4way are all out in the same direction. Could it have something to do with probe compensation? I pick up the fixture in 0,0 and Verify the 2way and 4way in 0,0. My head hurts. My C drive crashed last week and reformatted maybe has something to do with that? I will try rebuilding the probe file tomorrow when i get in.

Are your fixtures an external alignment? Did you rerun the fixture alignment prior to the in-program checks? Do you have master/backup copy of the program you can review to ensure no code has changed?

Alignments are run inside programs, not recalled. I think the issue is stemming from a calibration issue. I am also running 120mm in extensions on this TP20 so apparently that is not optimal either. My company currently has no QE or QC and the manager here isn't familiar with the CMM unfortunately so im stuck doing all the thinking or lack of Thanks guys

Well, it seems a bit odd that the calibration is only impacting your alignment features. If there were a linear shift calibrated in the probe angle, it should show the same linear shift through all of your program. Did someone mess with an alignment and accidentally save the file?

R2ah1ze1l Im seeing a linear shift in the X Axis of my machine on everything ( 0.5mm) I am the only operator here, first time running the programs just trying to make sense of everything.