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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.
  • How do I change the wrist rotation speed? I tried changing WRISTSPEED/ from 100 to 1 and it appears to be rotating at the same speed as before the change...

    The "Display absolute speeds" box is checked if that helps, and the "Top speed" is set to 300mm/sec. Also "Automatically Adjust Probe Head Wrist" is turned off.

    Edit: I did some research and, apparently, it's not possible to adjust the wrist speed on this head (HH-A-T5)...can someone please confirm that?

    I did see something about wrist rotation speed from 400, which looks like could be changed. But I did not try before.

    Here was a thread about this topic

    https://www.pcdmisforum.com/forum/pc-dmis-enterprise-metrology-software/pc-dmis-for-cmms/390009-wrist-rotation-speed
  • One of my go to solution for any weird probe behaviors is to delete the .prb file and recreate it.

    Just a thought, if it's the same angle causing issues, check the User defined calibration order in the Probe utilities menu and calibrate that angle first and see if the rest of the calibration completes.

    I had a Renishaw head that was on its last leg that failed to change to one of our most used angles when rotating from + to - but would work fine when I rotate to the next angle and rotate back.
  • One of my go to solution for any weird probe behaviors is to delete the .prb file and recreate it.

    Just a thought, if it's the same angle causing issues, check the User defined calibration order in the Probe utilities menu and calibrate that angle first and see if the rest of the calibration completes.

    I had a Renishaw head that was on its last leg that failed to change to one of our most used angles when rotating from + to - but would work fine when I rotate to the next angle and rotate back.

    Interesting. And those are both good ideas. So far Hexagon said they think the probe file is corrupted. I was able to get the issue on video. The wrist disengages, then the wrist rotates (completely) to the next angle, then the wrist re-engages, then the wrist Confused disengages again Confused and it rotates to the random A30 angle...

    This has happened on TWO probes so far. And I wasn't able to replicate it by creating a program that rotates back and forth between the problematic angles. The issue is only happening during my autocalibration program.

    Also, funny, my program just ran the whole way through fine, as if the probe files or program are half corrupted...........
  • Welp, I finally got it to fault while rotating back and forth over and over again (in a fresh program). Looks like it's a mechanical issue Disappointed

  • I saw it. Wrist speed..... Did you try before?

  • in reply to Lukas
    if it unseat, rotates, re-seats, then drops, chances are the head is FUBAR. That is how the Renishaw PH heads act when they are on their way out. The old (PH9) head had a set screw so you could increase the locking pressure and thus get some more life out of them, the new (PH10) heads do not have that set screw.
  • in reply to Lukas
    Yep it reseats but the light doesn't turn back on and it drops. For now, using an intermediary tip angle is working. so intead of A90B-75 to A90B-60. So I am doing A90B-75 then A0B0 then A90B-60. I wonder how long that will work for...thoughts?
  • Yes, I tried that. It does nothing. If anyone knows how to change the wrist speed that would be great to at least try.
  • in reply to Sora5
    Yeah, if I do an intermediary angle that works. Did the Renishaw head ever get worst (completely go bad) or were you able to use that workaround indefinitely?
  • in reply to Lukas
    Neither of the two calibrations at my current company had they even removed the baffles to even look at the scales, let alone clean them. I thought maybe it was because we don't have the SMA. Haha! Seems everywhere else I worked, the covers were all removed and the machine was cleaned and dusted from top to bottom.
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