Autocalibration (Long probes vs. Small CMM meas. range)

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  • Autocalibration (Long probes vs. Small CMM meas. range)

    Hello everyone.

    I have a problem with probes calibration. Actually we're using Manual calibration but I want to use the Autocalibration but then a problem occurs.
    The situation looks like this:

    We've got a long probes+extensions vs. small table (measuring range) so during the autocalibration when the probe angle changes (especially during A90BXX angles) there's a possibility that a probe can hit the CMM bridge or a probe changer, etc.) so I see two ways to solve this problem:
    1. Set up an angle order for autocalibration,
    2. Change the poistion for angle change so that the probe head would go exactly over the Cali.Shpere for an angle change.
    But I don't know how to do this - I never had this type of problem before since (always had max. probe lenght up to 50mm ).
    If you are able to solve this issue I'd be very grateful. Maybe there are other ways to do this.

    Thank you in advance!
    sigpic
    amor patriae nostra lex

  • #2
    well if you up grade to 2019 this will be fixed automatically for you they just added a feature in 2019 that dose exactly what you are asking but if updating is not in the picture you can use parameter sets with a defined order basically you group like angles, for example angles that are all on the right side of the cal sphere get grouped in to one parameter set then a move point over the center of the machine gets added between a second or third parameter set to get the one you are missing, one probe that i have takes 6 different parameter sets for it to safely calibrate
    Last edited by thomas pilc; 04-03-2019, 07:44 AM.

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    • #3
      That sounds like a handy addition thomas pilc !

      Could you create a few parameter sets?
      e.g. have a parameter set for all the angles for one side, have a separate parameter set with the angles for another side, and have a move point or 12 in between

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      • #4
        it would have been real handy if it was added in in 2016 when i had to learn all about parameter sets and defining a calibration order

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        • #5
          thomas pilc

          Problem with the Parameter set is that after finishing the "autocalibrate" command it automatically changes the angle to the angle that is set after the probe change.
          1. Firstly I choose a probe no.1
          2. Choose angle A0B0
          3. Autocalibrate (with some parameter set i.e. left side/right side etc.)
          4. Move point
          But if the "autocalibrate" ends with an angle i.e. A90B0 it will automatically change to A0B0 before the move point and hit the table <agonized scream>


          The idea itself is great but why does it change the angle automatically after the "autocalibrate"?
          Is it possible to switch it off somehow?


          <I have the 2018>
          sigpic
          amor patriae nostra lex

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          • RIDER
            RIDER commented
            Editing a comment
            What probe angle do you have at the beginning of your program right after the LOADPROBE command?
            Last edited by RIDER; 04-03-2019, 12:36 PM. Reason: Clarity

        • #6
          Originally posted by johnnyjohnson View Post
          thomas pilc

          Problem with the Parameter set is that after finishing the "autocalibrate" command it automatically changes the angle to the angle that is set after the probe change.
          1. Firstly I choose a probe no.1
          2. Choose angle A0B0
          3. Autocalibrate (with some parameter set i.e. left side/right side etc.)
          4. Move point
          But if the "autocalibrate" ends with an angle i.e. A90B0 it will automatically change to A0B0 before the move point and hit the table <agonized scream>


          The idea itself is great but why does it change the angle automatically after the "autocalibrate"?
          Is it possible to switch it off somehow?


          <I have the 2018>
          Choose angle A90B0 before the autocalibrate, then after the autocalibrate use the move point to raise the head, then rotate to A0B0.
          PC-DMIS 2016.0 SP8

          Jeff

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          • #7
            Originally posted by Schrocknroll View Post

            Choose angle A90B0 before the autocalibrate, then after the autocalibrate use the move point to raise the head, then rotate to A0B0.

            It won't work this way. It'll be like:
            1. A90B0
            2. autocalibrate i.e. A15B90
            3. A90B0
            4. move point
            5. Rotate to A0B0.

            For now I changed the Clearance Distance in the probe setup. It works of course but that's not all what I want. Because:

            - the Clearance Distance is generic for all the probes I have (I want only for one special probe),
            - it is set and affects also to the X+ calibration sphere that I'm using for other probe (I am not only using Z+).

            Thank You anyway guys for help.

            probe set.JPG
            sigpic
            amor patriae nostra lex

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