calibration problem

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  • calibration problem

    I'm having a problem calibrating tips A90B0 and 90,180, I'm using a PH10T with a TP20, I haven't made any changes to the probe build in a while or had any crashes, but the tip bumps the calibration tool and gives a movement interrupted error. If I select these two tips and take the first hit manually it gets through the first tip fine and then I get movement interrupted on the first hit on the second angle.
    PS, what is the correct vector for a calibration ball that is tilted toward the front of the machine at 30 degrees from verticle?

  • #2
    After you do your 0:0 tip exit the calibration and then return to it and try it again.


    • #3
      Curious.........why is your calibration ball or sphere tilted @ 30 degrees ???
      sigpic.....Its called golf because all the other 4 letter words were taken


      • #4
        When PCDMIS asks you if the sphere has been moved, click "yes", and re-calibrate A0B0. It will ask you to manually take a hit on the top. That should align your sphere for you.
        I used to be high on life but I built up a tolerance.

        Brown & Sharpe Global Advantage
        PCDMIS CAD++ v2011mr2



        • #5
          I used to experience the problem you describe. I believe it stems from calibrating some tip angles with the sphere in one location and then calibration other tip angles at a later date with the sphere in another location.

          My solution... First make sure your calibration sphere is fixed in place so that it can't move. Mine has moved in the past when using a medium force probe module. From the probe utilities menu select the tip angles you want to calibrate. Then click "measure" the measure probe window will open. In this window select the circle near the top right marked "DCC+DCC". Then click "measure". Click "yes" when asked if the tool has moved. Take your manual hit normal to the probe as usual. When you end the hit the CMM will take three DCC hits on the sphere to locate the spere. It will then progress through the additional hits as you have seen before. When it changes tip angles it will take one DCC hit normal to the probe and then three more to locate the sphere again. It will continue through in this manner for all angles.

          Since I started calibrating in this manner I have not had any more problems.

          Now, your next question...

          Using the pythagorean theorem and tangent you can calculate the vector. Since the vector tilted 30º is equal to 1 ... y²+ z²= 1². And, tan 30º=z/y. Solve one equation for one uknown z=y*tan30º. Plug into other equation y² + (y*tan30º)²=1². Solve for y... y=.866... Plug back into one equation .866²+z²=1² and solve for z.

          Your vector is


          • #6
            Oops, I forgot that the Y vector will be negative if the sphere is pointing toward the operator.


            • #7
              how's this for aggravating. . .
              four hours of banging my head against the wall and trying every trick I know plus a few new ones. As a last resort , CTRL + ALT + DEL
              problem solved. My entire calibration routine now runs fine .
              Thanks for the input.

              I NEED A BEER!!!!!


              • #8
                It is amazing how much reboot solves. That is our IT departments moto. 1)Because they are IT and we all know how much the average IT department delivers and 2)it is the cheapest fastest fix and cheap and fast are human nature.
                <internet bumper sticker goes here>


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