Concentricity between circles or cylinders

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  • Concentricity between circles or cylinders

    The question I have is what is the difference between measuring the concentricity between 2 circles (measured as circles) of the same diameter or between 2 cylinders (measured as cylinders) of the same diameter? Both circles or cylinders are on the same axis about 100mm apart?

    Thanks
    Dennis G............Don't worry Wilson! I'll do all the paddling! You just hang on!---Castaway

  • #2
    Using cylinders might use the centroid of the cylinder.

    But you realize that PCDMIS reports concenticity as POSITION, (as per ISO) and not opposing median points (as per Y14.5 ASME).

    Good luck.

    B&S CHAMELEON/PCDMIS CAD++ V2011

    There are no bugs, only "UNDOCUMENTED ENHANCEMENTS!"

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    • #3
      From the Help file

      The Insert|Dimension|Concentricity menu option calculates the Concentricity of two circles or cylinders, cones, spheres. the second feature that is entered is always the datum feature and may be a line feature that represents an axis.

      B&S CHAMELEON/PCDMIS CAD++ V2011

      There are no bugs, only "UNDOCUMENTED ENHANCEMENTS!"

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      • #4
        Coaxiality for cylinders, concentricity for circles.
        PC-DMIS CAD++ 2o19 R1 SP11

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        • #5
          Originally posted by vpt.se View Post
          Coaxiality for cylinders, concentricity for circles.
          +1 !

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          • #6
            I was taught to do conc between a circle and cylinder, with the cylinder being the datum. Regardless, concentricity with a CMM just outright sukks. Especially as the features get more distant from one another.
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            Global Advantage 12-22-10
            TESASTAR M SP25 4.3mr2

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