Star Probe Cal Issue

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  • Star Probe Cal Issue

    PCDMIS 2019 R1 on a SF CMM 4.5.4.
    I am having terrible issues trying to calibrate this star probe. It is the only probe for this cmm. I am using tip #1 A0B0 as the MASTER (i.e. selecting "yes" to qual sphere has moved). Tip 1 always calibrates but as soon as it moves to tip 2 I get the error shown below. Basically looks like an "out of range" error. I am thinking that maybe the the axes are getting flipped. IDK. I have tried every combination that I could think of (manual, DCC, Manual+DCC, DCC+DCC) and nothing works. I have a star probe in the lab that calibrates fine but it is part of a rack where I already have a master established. I feel that this should be a simple fix and that I am missing something. I have already scoured the forums for help and have tried the suggestions but nothing is working. Please help! (the rack in the background will not be used, fyi)

    cmm error.jpg
    probe setup.jpg

  • #2
    F9 on your LOADPROBE command, click "Setup..." and verify that the clearance distances are reasonable, and not too large for the probe/machine.

    You can also try "Reset tips" (set tips back to nominal) and then run a full calibration again - if someone has done a manual calibration using the wrong tip, for example.
    SW support - Hexagon Metrology Nordic AB


    • #3
      Looking at the picture, your ball is too far to the left. Also, if you widen the execute window, you can see the entire message. You might be able to get it to work where it is if you monkey with the values in the probe setup window, there are 3 different places you can change 'retract' positions
      Originally posted by AndersI
      I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.


      • #4
        Thanks, Matt! That was indeed the problem. Originally, I did not have a tip 2 and after adding it did not account for the extra space needed. LOL


        • #5
          with star probes the calibration result can tell you how straight it is built, help eliminate shanking... I always have a look.
          Example, X values for T1A0B0, T3A0B0, T5A0B0 are all theo 0 so you can tell pretty quick just how straight you got it just by how far off 0 they are.
          If T3A0B0 is -x value and T5A0B0 is +X value you can know which way to correct it too. Small tips like that on long shanks can shank out pretty easily so it is good to know a star is straight.


          • louisd
            louisd commented
            Editing a comment
            Yeah, whenever i build a star probe, i get out a v-block, square the vblock to fixture grid, and ensure the star is oriented as normal as possible to the v-block edges. I also have to redo orientation of stars when our probe body dies/gets replaced (mount orientation rotates).

          • Douglas
            Douglas commented
            Editing a comment
            I use one Ø.375 standoff and open the probe window showing last hit. Then I take shank hits on T2, T4 on the standoff and compare last hit y values. I can tell it is good this way even before calibration, but still check for sanity sake.

            the single standoff removes the need for anything to be squared up, just need last hit y values in machine coords
            Last edited by Douglas; 09-26-2019, 06:45 PM.

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