Shifting origins

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  • Shifting origins

    Hello everyone,

    I have a Brown & Sharpe MicroVal Pfx with PC-DMIS 3.5 MR2 software and have the following problem. The origins (x axis) of all of my programs seem to shift between 0.2 to 1mm after the DCC alignment, without any change to the fixture or anything else. I’ve even had a shift in the origin (x axis between theoretical and actual results) of 0.3mm with the same work piece that I had re-measured with the same fixture 10 min. later. Other axis deviations are no more than 3-4 microns (mm)! Has anyone had anything similar to this? Is this a mechanical or software problem? Any help would be greatly appreciated!
    Thanks in advance.

    Best regards

    Lepage
    ____________________________
    B&S MicroVal Pfx454
    PC-DMIS CAD++ V2011 MR1; TP200

  • #2
    Be sure to check your feature locations in the DCC mode. It could be something simple. F9 the feature.

    A.Gore
    sigpicA.Gore

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    • #3
      You stated origins? What do you mean by that? Your A_B_or_C Datums?
      sigpicSummer Time. Gotta Love it!

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      • #4
        its most likely someting simple that is out of order, causing it to fluxuate.

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        • #5
          Here are some things I've ran into with fluctuating dimensions.

          1) The Probe was lose on the module. Check to see if it's tightened.
          2) Probe was a little bent. Check to see if it's straight and recalibrate.
          3) Make sure you're using a correct force on the module? Not sure what material the part you are measuring is and what size probe you are using.


          All these sound like noob help but it helped me. Goodluck.
          I used to be high on life but I built up a tolerance.

          Brown & Sharpe Global Advantage
          PCDMIS CAD++ v2011mr2
          PH10MQ/SP600M


          sigpic

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          • #6
            I have had the tp2 go bad
            check one side 0.0 then op side off 1 mm diff direction
            DR Watson shut me down again !!!! :mad: Smoke break:eek:

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            • #7
              Are you aligning on a fixture and measuring the part or aligning on the part in a fixture?

              BS
              Windows 7
              Pc-Dmis 2015
              Global Performance 7-10-7


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              • #8
                Once a had a loose stlii, It took me all day to figure out what a doofus I can be.
                sigpicSummer Time. Gotta Love it!

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                • #9
                  Paul, I mean the origin of my DCC alignment.
                  ____________________________
                  B&S MicroVal Pfx454
                  PC-DMIS CAD++ V2011 MR1; TP200

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                  • #10
                    BS, I'm aligning a part in a fixture.
                    ____________________________
                    B&S MicroVal Pfx454
                    PC-DMIS CAD++ V2011 MR1; TP200

                    Comment


                    • #11
                      Do your datum setup one component at a time, Don't measure all of the features first and then go back and do the Datum setup all at one time.

                      eg. (simple)
                      measure plane, Level, set origin
                      measure alignment feature, align, set origin
                      measure third axis feature, set origin

                      I don't know if this is your problem, but I see it done all of the time and cringe at the potential error.

                      Anyway, happy green day....
                      Links to my utilities for PCDMIS

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                      • #12
                        CMMGUY,

                        I agree, the slow plodding method saves time (time after time). You always know the line is on the plane. The circle is seen in that plane. On and on.........

                        Terry King
                        sigpicHave a homebrew

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