Ghost touches

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  • Ghost touches

    Got called over to one of my other plants for a problem with things checking way out of tolerance.

    I got there and we watched as the program ran and it looked like the probe was coming short of the part but still taking readings.

    We watched closer and it was not always but it was.

    It then went to measure a cylinder and it started measuring at the top of the hole and went UP it measured just like it would have if it had been in the hole, the problem being it was measuring in space.

    Taking hits in space, beeping, and recording hits without touching a thing.

    I turned everything off restarted and still doing it.

    It is even doing it during calibration missing the sphere but registering hits.

    I see other have seen similar things but I don’t see where any solution has been found.

    I’m hopeful someone might have found a fix for this; if so please enlighten me; I am at a loss here.

  • #2
    What's the machine setup / probe type etc.
    sigpicHave a homebrew

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    • #3
      It's on a Mistral CMM
      PH10 with a TP20 on it.
      PC DIMS 2013 MR2

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      • tking
        tking commented
        Editing a comment
        Got a spare probe module or one you can borrow long enough to swap-n-see?

    • #4
      If you rule out magnets then I'd start to suspect wiring in the machine starting to fail somewhere.
      Systems Integrator
      Hexagon Manufacturing Intelligence

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      • #5
        Peter,
        I'd agree with you except for the fact it is actually acting like it is measuring in everyway except it is not touching anything at all.
        Also Why is it measuring UP out of the hole and not down into the hole.
        Bad wire does not make sense to what we're seeing but that's not to say that it isn't it; we have already thought of that.
        I'm hoping that someone that has actually seen this before jumps in and has a answer to what they did to solve the problem.

        Thanks for the input.

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        • #6
          This is pretty messed up.

          Is the stylus build a heavy probe longer than 50mm?

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          • #7
            No Josh that's is all good.
            We are running a 40mm but we have for years and years on that CMM.
            And it's not like a false trigger it's like it's touching something where there isn't anything.
            I'm at a loss....

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            • #8
              Originally posted by Tested View Post
              No Josh that's is all good.
              We are running a 40mm but we have for years and years on that CMM.
              And it's not like a false trigger it's like it's touching something where there isn't anything.
              I'm at a loss....
              I think there's a clue here:
              Originally posted by Tested View Post
              It is even doing it during calibration missing the sphere but registering hits.
              The fact that it's missing the sphere means something is really off in the system.
              Go back and try to run probe calibration again, and take note of where it's headed to when it misses the sphere - is it above, to the side, etc.


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              • #9
                Depends which hit you want to look at one to left, one to upper left, one to x-minus

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                • tking
                  tking commented
                  Editing a comment
                  At A0/B0 probe angle?

              • #10
                The last time I had a discussion about ghost touches, therapy & my HMO were involved
                SF7107(PCD), SF454(PCD), 152614(Quindos), 9159(Quindos), 7107(Quindos), B&S Manual, M&M Gear Checker

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                • DAN_M
                  DAN_M commented
                  Editing a comment
                  I am glad to know that there is always support around me =P

                • KIRBSTER269
                  KIRBSTER269 commented
                  Editing a comment
                  WOW, way to lower the bar on yourself, here I thought pretty highly of you, now I think your a weirdo

                • DAN_M
                  DAN_M commented
                  Editing a comment
                  Could the bar be ANY lower? I'm a PC DMIS programmer

              • #11
                tking,
                Sorry I missed you post.
                I did indeed swap out the module didn't help at all.

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                • #12
                  Our Co. has an old LK-G80 (Pc-dmis retrofit). Every once in a while does exactly the same thing (it will beep/register hits without touching the part).
                  It has to do with the scales but let me try to contact the CMM operator (different facility).
                  sigpicIt's corona time!
                  737 Xcel Cad++ v2009MR1....SE HABLA ESPAÑOL

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                  • #13
                    I'd bet you've got a cable / connection problem. Makes me wonder if it might perform OK up higher in the Z. Can you try a cal with the sphere 1/2 way up in Z?
                    sigpicHave a homebrew

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                    • #14
                      currently I can not cal. higher.
                      But will test that out

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                      • #15
                        Rpberto,

                        Please any help would be greatly appreciated

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