True Position of a notch to an OD

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  • True Position of a notch to an OD

    I created a notch using auto feature .059 x .140 true position callout is
    .059 +- .0005
    [.002][B,max]
    -B- is the outside diameter of the part.
    the notch is located on the Y c'line and .0295 on each side.
    hits are showing X-.0312, X+.0285 location is off?
    true position reads perfect 0.000000
    part is aligned to the face Z+ leveled to face
    rotated to the notch Y+
    origen to Z face X,Y to -B-

    thanks

  • #2
    ....
    RFS Means Really Fussy Stuff

    When all you have is a hammer - everything looks like a nail....
    sigpic

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    • #3
      did you true pos the X Axis? If I understand you correctly, the surface is Z zero, the center of the part is X Zero, and you rotated the X Axis to the notch center, then I would use the distance function for your true position. You are trying to dimension the face of the notch not the sides. correct
      Last edited by Paul Sarrach; 04-11-2006, 04:26 PM.
      sigpicSummer Time. Gotta Love it!

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      • #4
        NOTCH IS ROTATED TO Y+
        TRUE POSITIONED THE X AXIS

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        • #5
          If you rotate the +Y axis line through the notch then the X axis will be zero on the features used. Just like a fixture plate, when you measure a +Y line and rotate to it you then set the X origin on it as well.
          James Temmen

          There is no job so simple that it can't be done wrong.

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          • #6
            If you are using datums with mmc it may be .0000 true pos. pc-dmis uses a fitter. for mmc.Datums and features can rotate and shift within there tol.Turn mmc off to rfs then you should see your dev.

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            • #7
              can you scan and down load that?
              sigpicSummer Time. Gotta Love it!

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              • #8
                What controls the rotationaly alignment about the Datum B.

                btw...
                Why is your cylinder not your primary axis and the face secondary. I don't understand why you aren't leveling on the cylinder. esp when the notch is called out to -B-
                Links to my utilities for PCDMIS

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                • #9
                  It always helps when someone can post a drawing....
                  RFS Means Really Fussy Stuff

                  When all you have is a hammer - everything looks like a nail....
                  sigpic

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                  • #10
                    kev, your right. Guessing is not really helping, now is it. lol What we need is details,details,details...........................
                    sigpicSummer Time. Gotta Love it!

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                    • #11
                      It would be nice if whenever anyone had a question about position, datums, drawings etc... they would post a pic - or portion of - the drawing. it helps, and yes Paul - keeps from guessing!
                      There is a lot of info right here! You just have to make sure get the right info.
                      Kev
                      RFS Means Really Fussy Stuff

                      When all you have is a hammer - everything looks like a nail....
                      sigpic

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                      • #12
                        Done a lot of parts with a similar single notch called out to the Dia. Eng is looking for the to faces of the notch to be parallel to each other and perpendicular to your axis. Sometimes I think they pick TP because it was the only one anyone ever told them about in school
                        "A good design is the one that allows engineers the ability to change gracefully what they forgot to do right the first time!!!"

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                        • #13
                          boyd, can you download a pic?
                          sigpicSummer Time. Gotta Love it!

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