Auto Calibration

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  • Auto Calibration

    For "Auto Probe Calibration" . so i inserted below command. but while execution it calibrate angles, which are all used in this probe. i need to run only angles which are used in this program. how to set "Parameter Set' to calibrate angles used in this program?
    i am using PC-DMIS 2019R2.

    STARTUP =ALIGNMENT/START,RECALL:USE_PART_SETUP,LIST=YES
    ALIGNMENT/END
    MODE/MANUAL

    PREHIT/0.1
    RETRACT/0.1
    MOVESPEED/ 100
    SCANSPEED/100
    FORMAT/TEXT,OPTIONS, ,HEADINGS,SYMBOLS, ;NOM,TOL,MEAS,DEV,OUTTOL, ,
    LOADPROBE/PROBE_4
    TIP/T1A0B0, SHANKIJK=0, 0, 1, ANGLE=0
    AUTOCALIBRATE/PROBE, PARAMETER_SET=ALL-TIPS-WITH-DEFAULTS, QUALTOOL_MOVED=NO,
    CHECK COLLISION=NO, SHOW_SUMMARY=NO, OVERWRITE_RESULTSFILE=NO






    Calibration.PNG
    Last edited by Satheeshkumar; 11-12-2019, 08:43 PM.

  • #2
    To create a parameter set, open the probe dialog box of you the probe you wish to create the set for. Select the probe tips or all the probe angles. Click the measure button. In the Measure Probe dialog box, on the lower right of the window, there is a section called Parameter sets that has a name with a drop down box and save and delete buttons.

    So lets say we are going to make a parameter set for our master probe. I have have a 4x10 on tp20 and I have no angles, only A0B0. So I'll just click on the name box and type Master_Probe and click save. You should see a prompt that the parameter set has been created. So now go ahead a measure the actual probe. Some might say you don't have to actually measure it, but sometimes my parameter set wont appear in my code it I don't so I always do.

    Now go back to your program and F9 on the autocalibrate code and you'll see a little dialog box open. This is my master probe and my sphere never moves so I'm going to select Yes_DCC and selct my parameter set of Master_Probe, and show summary results.

    So if you run all that code, it will automatically select the master probe, run that parameter set and display calibration results.

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    • #3
      if you have another probe like a 4x20 with 10 different angles on it, do the same thing to create a parameter set. You can either select certain angles or all of them. If you are making a calibration program, you might as well calibrate all angles for each probe. i don't think many people make parameter sets for a hand full of angles but idk. Open the probe dialong box, measure button, create and save a name for the parameter set. add another line of code for Load 4x20 probe, tip 1 a0b0, autocalibrate tab and select the parameter set. For this parameter set, you'll select No to the sphere has move question since we already located the sphere with the master probe. Yes manual hit and yes dcc are only used on the master probe and for only locating the sphere.

      Say you created the next parameter set and you need to add an angle to the 4x20. open the probe dialog box, add the angle, measure button, select the parameter set in the measure window and click save to update the new angle to the set. Now when you run your program, the newly added angle will be calibrated like your other angles.

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      • #4
        Now if you want to get fancy, you can automatically print out a pdf with all the calibration results and even use variables and assignments to check the standard deviation of the results and have pcdmis re run a parameter set if the results are out of you criteria. I use if the standard deviation is greater than 0.0005", go back and repeat once, and if the results are still out, go to an error message stating help is needed.

        this way operators just run the cal program without having to manually calibrate anything and we have a record when calibration is done.

        Let me know if you have any other questions.

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        • #5
          Here are a few rules about "master probes"

          1. if you are using a tp20 (touch trigger), use a large diameter ruby with a short stem like 4x10 or 5x10. If you don't have something these size just use what you have but just make that probe the master probe.
          2. If you are suing a LSP scanning head, you can use a 5x20. That is only size that is supposed to be used for the lower matrix calibration so might as well make it the master probe for the probe calibrations.
          3. I don't use my master probe for any measurements, I only use it for locating the sphere and calibration. My parameter set just has angle A0B0. Some people have to use their master probe for measurements and that fine. Some people have multiple angles with their master probe and that fine too. You gotta do what you gotta do sometimes.
          4. On some of my machines, the cal sphere physically doesn't move from the granite. So when I add an angle to a probe, I update my parameter set for my cal program and calibrate that 1 new angle by answering no, sphere has not moved and everything is good. My other machines however, the sphere has to be moved in and out for parts. So when I need to add a new angle, I have to first place my sphere back where I originally had it, run my master probe with YES DCC, load my probe with new angle, add my angle to the parameter set for my cal program, and then run that new angle. Awesome.
          5. You only need 1 master probe. I don't think people have more than one master probe.
          6. This doesn't apply to me but some people have to use 2 calibration spheres. I know the procedure is somewhere on the forum, just search for it if you need it or maybe someone will chime in on this thread.

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          • #6
            Thank you so much acgarcia

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