Probes won't calibrate

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  • #1

    Probes won't calibrate

    I have tried searching and can't find information on my specific issue.

    I am trying to calibrate probe angles that I am using for my program prior to use. When I I calibrate, the angle are exceeding the limits and require recalibration. However, it is a repeated issue. I have change my stylus out, cleaned the artifact, and still have the issue. We are in a controlled lab at 68 deg. F, but I am noticing our RH is at 60%. Is the humidity my issue?
    Tags: None
  • #2
    double check the calibration ball itself, make sure it is the correct ball and size.

    Capture.JPG
    (In Memory of my Loving wife, "Ronda" who I lost March 7, 2016. I love you baby.)
    They say "Nobody's Perfect." I must be Nobody.

    Comment

    • jjohnson0928
      #2.1
      jjohnson0928 commented
      07-31-2019, 11:22 AM
      Editing a comment
      It is showing the correct ball and size.
  • #3
    What are the limits ?
    Which one does exceed ? (diameter or stddev ?)

    Comment

    • #4
      Horizontal arm? Bridge?
      Systems Integrator
      Hexagon Manufacturing Intelligence

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      • #5
        It's exceeding standard deviation and diameter. I am using a bridge CMM Advantage.

        Comment

        • #6
          Originally posted by jjohnson0928 View Post
          It's exceeding standard deviation and diameter. I am using a bridge CMM Advantage.
          Are you sure you have the correct probe build?
          Whatever a man sows, he shall reap.

          Comment

          • jjohnson0928
            #6.1
            jjohnson0928 commented
            07-31-2019, 12:14 PM
            Editing a comment
            Yes, I verified the profile is correct.
        • #7
          Tell us what type of stylus build your trying to calibrate and on what type of probe head.

          Comment

          • jjohnson0928
            #7.1
            jjohnson0928 commented
            07-31-2019, 12:34 PM
            Editing a comment
            I am using a 2x40 stylus on a 10mm extension into a LSPX1H. My analog scanning probe is a Leitz_LSPX1H, which goes into a TESASTAR_SM7.5_80-TKJ.

            This is the same probe file and everything that was working with no issues yesterday.
        • #8
          How much Standard Deviation and diameter error are you getting?

          Comment

          • jjohnson0928
            #8.1
            jjohnson0928 commented
            07-31-2019, 01:12 PM
            Editing a comment
            .0037 on standard deviation, .0046 on diameter
          • andrewb91
            #8.2
            andrewb91 commented
            07-31-2019, 01:56 PM
            Editing a comment
            In inch or mm?
          • jjohnson0928
            #8.3
            jjohnson0928 commented
            07-31-2019, 02:14 PM
            Editing a comment
            Our machine is in inches
        • #9
          https://www.pcdmisforum.com/core/images/default/default_avatar_thumb.png #7.1

          jjohnson0928 commented
          Today, 11:34 AM
          Editing a comment

          I am using a 2x40 stylus on a 10mm extension into a LSPX1H. My analog scanning probe is a Leitz_LSPX1H, which goes into a TESASTAR_SM7.5_80-TKJ.

          This is the same probe file and everything that was working with no issues yesterday.
          Maybe it's time to delete it and rebuild it.
          (In Memory of my Loving wife, "Ronda" who I lost March 7, 2016. I love you baby.)
          They say "Nobody's Perfect." I must be Nobody.

          Comment

          • #10
            Update

            This issue is not specific to this probe file. I am having the same problem on all 6 of my probe files

            Comment

            • #11
              It's time to check air bearings... Quickly !
              • Likes 2

              Comment

              • #12
                Double-check the 2mm ball for damage.
                sigpicV2014mr1

                Comment

                • jjohnson0928
                  #12.1
                  jjohnson0928 commented
                  07-31-2019, 02:23 PM
                  Editing a comment
                  I had the issue, switched out the stylus, issue remains
              • #13
                I would start from the ground up.

                What I would do:

                1) Clean the machine
                2) Clean the probes
                3) Verify that my equipment is not damaged. Probably on a comparitor or an OGP or something if you have one. Then put it all back on the machine. Ensure everything is snug and still clean.
                4) Delete probe file and sphere file completely.
                5) triple check that you are 10000% certain of the exact equipment you have
                6) rebuild the probe file and sphere file & triple check that the numbers are 10000% correct
                7) verify that there are no other environmental factors that could be influencing your calibration (surface grinders/other machine running nearby causing floor vibration, forklifts driving right outside your CMM room, etc....)
                8) IF all of the above checks out.......attempt to qualify

                If you go though the above and still have an issue, I recommend calling the OEM for service. The equipment you're describing is supposedly a nice scanning head...you should get WAY better results then 0.00037! =(
                Last edited by DAN_M; 08-01-2019, 09:10 AM.
                • Likes 4

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                • #14
                  Use some putty and make sure there isn't something lodged in the probe where the stylus connects, I had this happen on a Renishaw system once.

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                  • #15
                    One suggestion to try... just because i've done it. when you started having the problems did you try to insert the stylus manually onto the probe head? i was having a similar issue and someone ispoke to told me to put the stylus back in to the probe rack, tell the probe head that it had nothing(unload) and then do a LOADPROBE to grab the stylus. when i did this it calibrated seamlessly. he said the software needed to balance the probe and that got skipped by loading manually. worth a try if you havent fixed it already

                    Comment

                    • louisd
                      #15.1
                      louisd commented
                      08-01-2019, 03:24 PM
                      Editing a comment
                      probe rebalance can also be done by pressing the top left "Probe Enable" button on the jogbox off, then on again, fyi.
                    • charliejoe
                      #15.2
                      charliejoe commented
                      08-05-2019, 03:17 PM
                      Editing a comment
                      Awesome, i didnt know that. thanks!
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