Profile of a Surface

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  • Profile of a Surface

    Having problems tolerancing profile of a surface

    Using 2009 MR1
    Tolerancing with Xactmeasure

    See attachment to see callout (dim 5)

    I measure two cylinders (one for each Radius R10 & R15)

    I get a couple of problems during tolerancing.

    1. When I try to apply the modifier to Datum C, the software tells me "encountered an improper argument" (Do I not get bonus on this Datum because of the Bonus of Datum B)

    2. When I disregard the MMC on Datum C, I select both cylinders and it forms a feature set, however, i only get two points for my text analysis, and it is reporting the deviation of my Z axis deviation.

    Datum A on the CMM is Z+


    VST011 part print copy.jpg

  • #2
    Profile does not allow bonus.

    B&S CHAMELEON/PCDMIS CAD++ V2011

    There are no bugs, only "UNDOCUMENTED ENHANCEMENTS!"

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    • #3
      PC-DMIS is correct. You can not have a virtual condition on datums (the MMC behind the B and C) if you call for surface profile. See the standard. What is datum B???
      ***************************
      PC-DMIS/NC 2010MR3; 15 December 2010; running on 18 machine tools.
      Romer Infinite; PC-DMIS 2010 MR3; 15 December 2010.

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      • #4
        Originally posted by RyanCarr View Post
        2. When I disregard the MMC on Datum C, I select both cylinders and it forms a feature set, however, i only get two points for my text analysis, and it is reporting the deviation of my Z axis deviation.
        It is reporting the cylinders from their respective center. 2 cylinders, 2 points. Either use a scan or vector points and create a feature set.

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        • #5
          Originally posted by Jan d. View Post
          PC-DMIS is correct. You can not have a virtual condition on datums (the MMC behind the B and C) if you call for surface profile. See the standard. What is datum B???
          I thought the modifier wasn't allowed on the feature itself, but allowable on the Datums. This would be applicable for a Datum shift... I sought out the standard and if i read it correctly, i thought it says i could (on at least Datum B).

          Datum B is the other through hole. Sorry i cut that out by accident.
          Last edited by RyanCarr; 05-19-2011, 01:35 PM.

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          • #6
            Originally posted by RyanCarr View Post
            Having problems tolerancing profile of a surface

            Using 2009 MR1
            Tolerancing with Xactmeasure

            See attachment to see callout (dim 5)

            I measure two cylinders (one for each Radius R10 & R15)

            I get a couple of problems during tolerancing.

            1. When I try to apply the modifier to Datum C, the software tells me "encountered an improper argument" (Do I not get bonus on this Datum because of the Bonus of Datum B)

            2. When I disregard the MMC on Datum C, I select both cylinders and it forms a feature set, however, i only get two points for my text analysis, and it is reporting the deviation of my Z axis deviation.

            Datum A on the CMM is Z+


            [ATTACH=CONFIG]6676[/ATTACH]
            Additionally, the Profile refers to the entire surface, and not just the radiused ends. Scan or create vector points all around, create a Feature Set from the collected points, and Profile the set.
            sigpic

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            • #7
              Originally posted by ir a programmer View Post
              Additionally, the Profile refers to the entire surface, and not just the radiused ends. Scan or create vector points all around, create a Feature Set from the collected points, and Profile the set.
              Very true... I forgot to mention that this outside surface is extruded and thus, if my feature set from the two radii are in specification, so will the sides since they are merged from the two ends.

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              • #8
                Originally posted by dph51 View Post
                Profile does not allow bonus.
                Yes it does. I believe it is in the 2009 revision

                Originally posted by Jan d. View Post
                PC-DMIS is correct. You can not have a virtual condition on datums (the MMC behind the B and C) if you call for surface profile. See the standard. What is datum B???
                See above comment

                Originally posted by RyanCarr View Post
                I thought the modifier wasn't allowed on the feature itself, but allowable on the Datums. This would be applicable for a Datum shift... I sought out the standard and if i read it correctly, i thought it says i could (on at least Datum B).
                You are correct
                Datum B is the other through hole. Sorry i cut that out by accident.
                Originally posted by RyanCarr View Post
                Very true... I forgot to mention that this outside surface is extruded and thus, if my feature set from the two radii are in specification, so will the sides since they are merged from the two ends.
                That is incorrect. just because the two radius make up either end has no bearing on how the sides have been created. If I am wrong tell me so.
                sigpic

                James Mannes

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