Concentricity Question in 4.1

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  • Concentricity Question in 4.1

    I have a concentricity dimension that isn't making much sense to me. I am using version 4.1 and using the legacy dimensioning. I have posted my dimensions below. Both of these bores are measured as circles. Should be simple stuff but the concentricity calculation isn't making sense to me based on the deviations of the features themselves.

    Am I doing something wrong here or is PC-DMIS not calculating properly?

    DIM LOC5= TRUE POSITION OF CIRCLE SP-455-20 (BEARING) UNITS=MM
    AX MEAS NOMINAL +TOL -TOL BONUS DEV OUTTOL
    Y 299.7350 299.7300 0.0049
    Z 398.9894 399.0000 -0.0106
    DF 85.0157 84.9990 0.0200 0.0000 0.0167 0.0000
    TP RFS 0.0360 0.0000 0.0234 0.0000

    DIM LOC6= TRUE POSITION OF CIRCLE SP-455-20 (THRU) UNITS=MM
    AX MEAS NOMINAL +TOL -TOL BONUS DEV OUTTOL
    Y 299.7352 299.7300 0.0052
    Z 398.9898 399.0000 -0.0102
    DF 52.0046 52.0000 0.0200 0.0000 0.0046 0.0000
    TP RFS 0.0360 0.0000 0.0229 0.0000

    DIM CONCEN1= CONCENTRICITY FROM CIRCLE SP-455-20 (BEARING) TO CIRCLE SP-455-20 (THRU) UNITS=MM
    AX MEAS NOMINAL +TOL -TOL DEV OUTTOL
    M 0.0211 0.0000 0.0130 0.0000 0.0211 0.0081

  • #2
    say what you think the problem is.
    Links to my utilities for PCDMIS

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    • #3
      Well, I don't think it's calculating concentricity properly based on the deviations of my to holes.

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      • #4
        Concentricity should be used on cylinders. Am I wrong?
        sigpic GDTPS - 0584

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        • #5
          Originally posted by inspector212 View Post
          Concentricity should be used on cylinders. Am I wrong?
          I dont think it has to be.

          The number certainly dont jive, but there is so much not said here that it is difficult to pinpoint the problem. Maybe it is active workplane view or datums... No drawing, no program.. need more info.
          Links to my utilities for PCDMIS

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          • #6
            Originally posted by cmmguy View Post
            I dont think it has to be.

            The number certainly dont jive, but there is so much not said here that it is difficult to pinpoint the problem. Maybe it is active workplane view or datums... No drawing, no program.. need more info.
            I was thinking of cylindricity. Never mind.

            Concentricity may need two features. Select one for the feature and then the second for the datum. Worth a try. Also open up the concentricity window and hit F1.
            sigpic GDTPS - 0584

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            • #7
              Originally posted by inspector212 View Post
              I was drinking cheap mass produced beer. Never mind.

              I think tonight I will try to summon some courage and buy a bottle of Whiskey. Worth a try. Also I might pick up a new pair of pantyhose. I saw some really nice hot pink ones at Walmart the other day. . .


              Up your nose with a rubber hose.
              sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery

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              • #8
                Are the vectors exactly the same? If the vectors weren’t the same the projection of the datum feature would make it farther out.

                Hey maybe this'll help....
                Last edited by Sinned; 05-29-2008, 12:47 PM.
                sigpic
                If A Pretty Poster And A Cute Saying Are All It Takes To Motivate You,
                You Probably Have A Very Easy Job. The Kind Robots Will Be Doing Soon.

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                • #9
                  hmmmmm,

                  could be shanking?




                  G
                  sigpic

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