Position/Concentricity - Cylinders or Circles?

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  • Position/Concentricity - Cylinders or Circles?

    I have a tube with a bore at each end. Outside of the tube is primary datum. Would you then measure the bore features as cylinders, (3d), or circles, (2d), to report postion and/or concentricity?
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    Global Advantage 12-22-10
    TESASTAR M SP25 4.3mr2

  • #2
    measure each bore at 2depths from each end and report positions.

    B&S CHAMELEON/PCDMIS CAD++ V2011

    There are no bugs, only "UNDOCUMENTED ENHANCEMENTS!"

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    • #3
      Originally posted by dph51 View Post
      measure each bore at 2depths from each end and report positions.
      Ok, measure them as cylinders or circles? Cylinders are 3d, and circles are 2d. I have 2 enginerds that are arguing over this.
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      Global Advantage 12-22-10
      TESASTAR M SP25 4.3mr2

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      • #4
        If you are aligned to the OD it should not make any difference.
        If you want to know the orientation of the ID to the OD you would use cylinders.
        If you just need location at each end circles should work.
        Lately, it occurs to me
        What a long, strange trip it's been.

        2017 R1 (Offline programming)

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        • #5
          Position: (3D) what dph51 said or I would measure both ends as cylinders and then report “From the worst end of axis” or “From both ends of axis” but never “From axis average”

          Concentricity = Circular runout (sort of...): Concentricity is applied to each cross section therefore I would treat it as 2D….

          HTH

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          • #6
            Originally posted by keego View Post
            Ok, measure them as cylinders or circles? Cylinders are 3d, and circles are 2d. I have 2 enginerds that are arguing over this.
            shoot one of the enginerds.

            B&S CHAMELEON/PCDMIS CAD++ V2011

            There are no bugs, only "UNDOCUMENTED ENHANCEMENTS!"

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            • #7
              Level to the O.D. datum. The only differences you're going to see in I.D. position or concentricity are if you measure as a circle the position of the circle will report out from its center along the datum axis. If you measure as a cylinder the position that reports out will be from the baricenter (sp?) of the cylinder along the datum axis. Coaxiality is a whole other can of worms and requires all cylinders.
              v2010 CAD ++ Global Image 121510

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              • #8
                [QUOTE=lambo;292156]Position: (3D) what dph51 said or I would measure both ends as cylinders and then report “From the worst end of axis” or “From both ends of axis” but never “From axis average”


                As Lambo says. Check the help file under position/axial feature

                From Axis average > centroid of axial feature
                From Start point > start point of axial feaure
                From End point > at end point of axial feature
                From worst end of axis > outputs from worst end case
                From both ends > outputs position from both ends

                B&S CHAMELEON/PCDMIS CAD++ V2011

                There are no bugs, only "UNDOCUMENTED ENHANCEMENTS!"

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