true position in 3 axis

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  • true position in 3 axis

    true position in 3 axis

  • #2
    are you asking?
    tp of spherical features is best done with X,Y,Z

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    • #3
      As far as I have ever seen ( not saying it is nonexeistent ) there are not callouts for 3d TP...It is a diametral tolerance, hence, diameter.

      Unless it is somehow specifically called out as 3d TP, always assume its not...
      Jim Jewell

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      • #4
        [tp|SØ0.4|A|B|C]

        In ISO-land, the above means a spherical TP, alas a 3D TP.
        But this calls for the "S" before the "Ø".
        PC-DMIS CAD++ 2o19 R1 SP11

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        • #5
          Spherical exists in ASME land also. As does conical, which I have not seen yet.

          Kinda like bigfoot. It's rumored to exist, but .........seldom seen.

          B&S CHAMELEON/PCDMIS CAD++ V2011

          There are no bugs, only "UNDOCUMENTED ENHANCEMENTS!"

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          • #6
            Like I said, not that its non existent, but I have yet to see it used...
            Jim Jewell

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            • #7
              turn off "deviation perpendicular to centerline" - will result in spherical, 3 axis true position.

              I would recommend a 2nd look at your program, make sure you are using the most accurate feature to capture 3 axis (definately not measured features). The only reason I would see to use spherical true position would be a cone or a sphere; if a cone, I highly recommend 3 sample hits.

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              • #8
                Strictly speaking, the standard calls for a cylindrical zone instead of diametric.

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                • #9
                  Originally posted by vpt.se View Post
                  [tp|SØ0.4|A|B|C]

                  In ISO-land, the above means a spherical TP, alas a 3D TP.
                  But this calls for the "S" before the "Ø".

                  I believe TP for spherical is 2Xsq[(a2)+(b2)+(c2)] = SØ
                  2XSQ(A+B+C)

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                  • #10
                    Originally posted by jbeaudoin View Post
                    Strictly speaking, the standard calls for a cylindrical zone instead of diametric.
                    Technically correct, but misses the mark. All diametrical True Positions are 3D, or 3 axis, and their zones are cylindrical.

                    I would guess that the OP is asking about TP of a hole on a compound angle to the FCF. It is still a cylinder, but unlike a hole square to an axis (at (0,0,1) you can locate the hole with only XY axes, at any given crosscut of the cylinder), you need all 3 axes to locate a compound feature.

                    OP, you can check "Deviation Perp to CL" to force the dimension to calculate as though it were looking straight through the hole. (This ignores which axes you have chosen to report out, whether XYZ or XY, etc).
                    Last edited by VinniUSMC; 05-03-2016, 06:46 AM.
                    "This is my word... and as such is beyond contestation."

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