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probes crash into calibration sphere

JFournier
I want to avoid asking things already answered here in the forum, and there are several cal sphere posts, but none answer my issue so far.

After qualifying my Master probe, the subsequent probes are crashing into the sphere as if they think its lower in the Z-axis.

I'm using TP20 probes and these same probes worked previously

My process looks like this:

1. Master probe (3x20mm on std module) using 25 hits, DCC+DCC, reset to theo, selecting "YES" cal sphere moved and taking first manual point. Results are good at .0000"-.0002"

2a. 1x50mm probe at A0B0, using 13 hits, DCC+DCC, selecting "NO" cal sphere did not move
2b. Sometimes I use "user defined", sometimes I use "default mode", doesn't seem to work regardless

3. Proceeds to crash straight down into sphere.

Anything look obviously wrong in this process? Pics show both probe setups and options. Probes were measured for length and checked for tightness.

  • #2A Try using MANUAL+ DCC. to calibrate the first time with your 1x50 probe. might help.

    Check your probe builds.

    HTH
  • Sometimes a .prb file decides it wants to retire. Take SS of all your settings, parameters, and angles. Delete the .prb file and create a new one.

    I've had numerous occasions over the years where "something" happened, like a power outage, and one or more .prb file gets corrupted and crashes into the sphere or miss it entirely and nothing fixes it except to delete the .prb file and create a new one. I've long since create backups of any new probes I add to a CMM to recover from for these instacnes.
  • Did you already attempt to use the 'Reset Tip to Theo' checkbox? That can clear out some issues and enable the calibration to return to normal.
  • you should be on 25 hits, 4 levels, 0 to 90 on all your probes, not just the master probe, but that's not your problem, just an observation.

    The builds equate, so as long as that is what is physically present, you are ok.

    As suggested, a MAN + DCC should solve the problem, this can get harsh if you have a lot of angles.

    On my new machines, I had to increase the approach/retract to .300" rather than .100" or else most angles hit. (My only new contribution to this thread)
    It didn't help with qualifying the positions themselves, but do not check the box for collision avoidance during qualification (if that is present). It smashes the probe into the sphere for me when it is done qualifying in the version I use, anyway.

    I would also, as stated above, clear the probe file at a minimum (Reset Tips). If there is any kind of problem after that, delete the probe file off the hard drive and rebuild it from scratch.

  • i had some issues with it, if you calibrade all probe with man+dcc it will be fine after that Slight smile Hope that works for you, it worked for me several times
  • If you calibrate MAN+DCC it will work, but it is a work around.

    I can see from the screenshot but your Master probe has some offsets in it, so it's been calibrated with 'No - the sphere has not moved' at some point (the offsets are very small so it's not a major issue but it means the correct procedure has not been followed at some point).

    Your 1by50 probe however should have a Z Offset of 8.3189, yours currently has a Z offset off 8.9571 so it thinks it's ~0.6" longer than it is.

    Reset the1BY50 (and why not reset the Master probe whilst you're at it?) and start again.


    Btw: this is the danger of using MAN+DCC in cases when it's not really needed - you can end up with these huge offsets (and get a cumulative effect).
  • Thanks all for the suggestions. I did manage to make it work by just rebuilding the three probe files I needed to start fresh and requalifying. I saved the new probe files as backups and I will incorporate some of these other suggestions as well. I appreciate all your help!
  • in reply to NinjaBadger
    Indeed you're right, I did calibrate the master with the "no" selection to see if that was going to crash like the others, just part of the troubleshooting I was trying. I did reset it for the final calibration though.
  • We have this issue sometimes with our tips and what we have found to work is deleting the angles then clicking the mark used button to add them back in, Then calibrate as normal and this usually works for us
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