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Issue with rotating head

Lukas
My machine tries to rotate to say a90b80 and it only gets to say a40b80…same issue with a few other tip angles…then, I believe it tries to probe the cal sphere with the head at the wrong angle, and of course the tip is no where near the cal sphere so “probing not within limitation.” I believe that is the error. I haven’t seen it happen in action yet, but when I returned to the inspection lab I believe the red light on the head is turned off and the head is disengaged. If I recall correctly, I don’t think I had to hit the estop to reset the jog box. I cancelled running the program, then I typed tip/T1A0B0. When it asked to rotate to A0B0 I clicked yes and it worked fine. Then I tried the same thing with the tip angle in question (a90b80). Again, rotated fine. So I’m not understanding why my program won’t run through…

Any ideas what the problem might be? I tried changing the probe module and wiping down the scales. No luck.

So far, this issue is only happening with my auto calibrate program (which calibrates “all tip angles”). I haven’t tested running a part because the machine is not fully calibrated. However, my auto calibrate program has been unchanged for about a year now…I don’t believe I have even added a single tip angle recently…my autocalibrate program has been working so well up until now!

Sorry for the wall of text, I am just trying to figure this out. Tomorrow I can try calibrating different probes and see if there’s the same issue with the other probes.
  • The head is a Hexagon HH-A-T5.

    I am attaching a photograph of the machine when I got in this morning as well as a screenshot of the software. It stopped at one of the few tip angles that it keeps stopping at. They are all A90BXX. It looks like it tried rotating to A90B-60. It only got to A30B-60 and stopped rotating.

    So far I've tried: restarting the machine, changing the probe module, and wiping down the Z-axis scale. I am opening a ticket with Hexagon but if anyone has any ideas at all I would really appreciate it...
    Attached Files
  • in reply to Lukas
    Could be that the head is on its way out.
  • I would unplug the head, check the wiring, and clean / grease the A axis.
  • Thanks for the input fellas. One idea I had was to delete those tip angles and use the -90 angles instead, but that's probably a very temporary fix.

    I'll refer to Hexagon for instructions on how to proceed with possibly cleaning the head.

    Honestly, when they came to do the calibration last winter they did a pretty poor job cleaning the machine, which I believe the PO requires. I think all they did was wipe the scales, and they did more harm than good. When they left, there was residue on the Z-axis scale from their cleaning agent, which caused the machine to error out. It took me a few hours to figure out what the problem was...
  • can you manually take the hit to locate the sphere?
  • can you manually take the hit to locate the sphere?

    If I understand your question, the sphere is located just fine. My autocalibrate program calls for the master probe at the beginning of the program, which requires a manual hit to locate the sphere. I take that hit, then I let it run. It picks up PROBE#3 (the probe with the issue) and begins "autocalibrating" it. It calibrates 27 tip angles just fine before it has the issue with the head rotating.
  • in reply to Lukas
    so if you single out the angle it's not rotating to in your autocal program, and do a manual hit to start dcc cal, then it runs fine?
    if so then maybe something wrong with the auto cal program?
  • My machine tries to rotate to say a90b80 and it only gets to say a40b80…same issue with a few other tip angles…then, I believe it tries to probe the cal sphere with the head at the wrong angle, and of course the tip is no where near the cal sphere so “probing not within limitation.” I believe that is the error. I haven’t seen it happen in action yet, but when I returned to the inspection lab I believe the red light on the head is turned off and the head is disengaged. If I recall correctly, I don’t think I had to hit the estop to reset the jog box. I cancelled running the program, then I typed tip/T1A0B0. When it asked to rotate to A0B0 I clicked yes and it worked fine. Then I tried the same thing with the tip angle in question (a90b80). Again, rotated fine. So I’m not understanding why my program won’t run through…

    Any ideas what the problem might be? I tried changing the probe module and wiping down the scales. No luck.

    So far, this issue is only happening with my auto calibrate program (which calibrates “all tip angles”). I haven’t tested running a part because the machine is not fully calibrated. However, my auto calibrate program has been unchanged for about a year now…I don’t believe I have even added a single tip angle recently…my autocalibrate program has been working so well up until now!

    Sorry for the wall of text, I am just trying to figure this out. Tomorrow I can try calibrating different probes and see if there’s the same issue with the other probes.

    You have issues with some angles during autocalibrate which you can manual rotate to, am I right? Can you slowdown the rotation speed with those trouble angles?

    I have an old renishaw PH10M which has issue rotating angles during calibration sometime ( less than once a week). I think it might be a mechanic issue in the header.


  • You have issues with some angles during autocalibrate which you can manual rotate to, am I right? Can you slowdown the rotation speed with those trouble angles?

    I have an old renishaw PH10M which has issue rotating angles during calibration sometime ( less than once a week). I think it might be a mechanic issue in the header.

    Yes, when my autocalibration programs runs it fails to rotate to a90b80. Then I click cancel and type tip/t1a90b80 in command prompt and when it asks me to rotate I click OK and it rotates just fine. Great idea. I will try that now. Hexagon has given me no suggestions as-of-yet. Also, update, it is happening with 2 different probes.
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