Measuring Ring Gage Tactile 2018 R2

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  • Measuring Ring Gage Tactile 2018 R2

    I'm still new to working with Tactile probes on a vision system, this is not the first time I have ran an cross sensor calibration but for some reason this time it just simply will not fallow through.

    I can't get ANY tactile probes to measure my ring gage during an cross sensor offset calibration.



    It will run through the camera offset calibration just fine then once moving onto the TTP the machine prompts me to take an ID point @ 6 o'clock.

    I take the 6 o'clock ID point and the probe then moves to about 2 o'clock takes an ID point then goes to 12 o'clock but instead of slowing down and taking a point it just crashes right in the Ring Gage.

    Anyone have any idea's what might be going on? TIA

  • #2
    Try taking the 6 o'clock point in the middle of the ID and OD of the ring - and as centered in X to the ID as possible.

    If that doesn't work, try take the 6 o'clock point closer to or further away from the ID, eventually, it will run OK.
    PC-DMIS CAD++ 2o22.2 SP2

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    • #3
      You can also increase prehit in the calibration window.

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      • AnaCat
        AnaCat commented
        Editing a comment
        This helped a lot, thank you, silly mistake on my part.

        However now it's giving me an error after trying to create the plan on top of ring gage. After it does this it gives me an absolute move prompt. The coordinates given are out of reach, it even gives an error message "out of travel". When choosing to skip this it then prompts me to take 9 hits with TTP at various coordinates that are no where near the ring gage.

        Regardless of that I have taken 9 points all around the ID of ring gage, and it then prompts me to take 2 more points in the ID.
        This is kind of where I have stopped. I have never ran into this, not even during my vision101 training. I'm wondering do I just continue and it will eventually calibrate?

    • #4
      Can you select man+dcc ?

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      • AnaCat
        AnaCat commented
        Editing a comment
        Yes I can, and do when doing any calibration. I just re-ran the whole cross sensor calibration, realized I had a few setting not set properly and was able to successfully run through calibration with two diff. probes.

        My new question (those seem to pop up a lot) is how to interpret the calibration results. I am sure they are good and fine, as it did not prompt me to re-calibrate. Will create another post within this to share results.

    • #5
      Was able to successfully run through 2 cross sensor calibrations with 2 diff. probes I built. Here are the results, I am questioning the note about probe dia. size. it says its .7874 which is the act. size of the ID ring gage. I am sure I am just not interpreting it correctly so thought I'd share it here.

      Sorry for the image, I do not have access to the intent on that machine I have to use a diff. company computer to post this.
      TIA


      cali_results_1.jpg
      cali_results_2.jpg

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      • #6
        I'm not sure to understand exactly...
        You're trying to calibrate a star probe into the ring ?
        Could you post the probe components that you use, the ring diameter .

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        • AnaCat
          AnaCat commented
          Editing a comment
          At the moment no, I'm not using a star probe. However, I do plan to build and calibrate a star probe after I sort current issues out.

          I'm using a 10mmx4mm probe (1st pictured results probe file = PROBE) and then 10mm extension x 20mmx1mm probe (2nd pictured results probe file = 20x20x1_Prob)
          ring gage size is 20mm (.7874 inch)

      • #7
        You should check "reset to theo" in the calibration window. X and Y deviations are strange between both calibrations.

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        • AnaCat
          AnaCat commented
          Editing a comment
          Thank you, I will try that tomorrow (heading out in a few mins.) Will give update.

      • #8
        You need to calibrate the probe on the sphere first. Then do the cross probe.
        Applications Engineer
        Hexagon UK

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        • AnaCat
          AnaCat commented
          Editing a comment
          Yes, I calibrated TTP on sphere 1st. Then I move to the ring gage to do a cross sensor calibration, Optics first then probe and above were the results.

        • NinjaBadger
          NinjaBadger commented
          Editing a comment
          Did you have 'Reset Tips' checked?

        • AnaCat
          AnaCat commented
          Editing a comment
          I have an option to reset tips, its not a check box. But no, I did not reset tips yesterday.

          Today I did, I reset my 20x20x1 TTP and re-ran calibration on the sphere then moved to the ring gage, calibrating the optics first then TTP. I can post results but they are the same. The tip offset numbers is the relation between the TTP and Camera I believe?

      • #9
        Measure Vision with Ring - Has Ring moved = YES
        Measure Probe 1 with Ring - Has Ring moved = NO
        Measure Probe 1 with Sphere - Has Sphere Moved = YES
        Measure Probe 2 with Sphere - Has Sphere Moved = NO
        Measure Probe 3 with Sphere - Has Sphere Moved = NO

        Don't break the calibration chain! I am posting this in hopes to have it made into a sticky since I see this issue arise a lot in the Vision section. This document


        Was the camera to tip offset setup correctly? Camera should be 0,0 in XY and the probes should have an offset in XY.

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        • AnaCat
          AnaCat commented
          Editing a comment
          Yes I fallowed this.
          I will post my updated Calibration results.

          My original issue when creating this post was solved, (probe crashing into ring gage) I had forgotten to increase my PreHit/Retract values.

          The second issue I had was understanding the calibration results. In an above post I showed calibration results and marked with red stars a note I did not understand.
          I also did not understand what the Probe offset was (I do now and realize its just the probe offset from the cameras center. I didn't remember that part of my training.)

          The now problem I am having Is after an manual alignment and going into DDC mode the program prompts me to make an "absolute move" then says Move is out of reach (it is.). After skipping that prompt it goes to probe the 1st PLN but does not go to the proper locations to probe. This I am sure is a programing error on my part. So now I am trying to figure what step I'm missing. However still not confident my calibration is correct.

      • #10

        My original issue when creating this post was solved, (probe crashing into ring gage) I had forgotten to increase my PreHit/Retract values.

        The second issue I had was understanding the calibration results. In an above post I showed calibration results and marked with red stars a note I did not understand.
        I also did not understand what the Probe offset was (I do now and realize its just the probe offset from the cameras center. I didn't remember that part of my training.)

        The now problem I am having Is after an manual alignment and going into DDC mode the program prompts me to make an "absolute move" then says Move is out of reach (it is.). After skipping that prompt it goes to probe the 1st PLN but does not go to the proper locations to probe. This I am sure is a programing error on my part. So now I am trying to figure what step I'm missing.

        I'm still not confident my calibration is correct. Here are my most current and up to date results. Sorry for photo quality.

        This is the Probe and Sphere Calibration which look good to me.....
        results_3.jpg


        Next is the Vision and Ring Gage
        results_2.jpg

        Here is the Cross Sensor Offset or Probe and Ring gage.....
        results_1.jpg
        ‚Äč

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