Tolerance actual feature or cast

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  • Tolerance actual feature or cast

    Tolerancing a feature for true position and I'd like to know which is the better method to use. I use 2 studs in the alignment and have toleranced a cast diameter for one of the studs. Is it better tolerance the actual feature after the alignment or tolerance a cast diameter of that stud?

    Other software that I have used you would have to recall that feature but I have seen that I do not have to do that in PC-DMIS. You get the same results but am wondering if it'll bite me in butt later.
    Xcel & MicroVal Pfx & Global 37mr4 thru 2012mr1sp3
    Contura Calypso 5.4

    Lord, keep Your arm around my shoulder and Your hand over my mouth. Amen.

  • #2
    Why are you creating a cast dia for the studs? I would use the actual.
    sigpic GDTPS - 0584

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    • #3
      Originally posted by dwade View Post
      Tolerancing a feature for true position and I'd like to know which is the better method to use. I use 2 studs in the alignment and have toleranced a cast diameter for one of the studs. Is it better tolerance the actual feature after the alignment or tolerance a cast diameter of that stud?

      Other software that I have used you would have to recall that feature but I have seen that I do not have to do that in PC-DMIS. You get the same results but am wondering if it'll bite me in butt later.
      If I understand your question correctly...You are asking if you can dimension a feature that you measured as part of an alignment.
      Short answer is yes.
      If that feature was measured manually, it is best to measure it again as a DCC feature and then dimension it. Manual measurements are not as accurate as DCC measured features.
      Lately, it occurs to me
      What a long, strange trip it's been.

      2017 R1 (Offline programming)

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      • #4
        As long as your not using the new alignment for a perfect approach vector on your studs it shouldnt matter where you call out the diameter.....

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        • #5
          Studs are measured as part of the initial alignment all being perp to the initial planar alignment. Like I said in the 1st post, some of the other software that I have used you had to recall that feature to tolerance it after making your part alignment.

          Thanks for the info.

          Duane
          Xcel & MicroVal Pfx & Global 37mr4 thru 2012mr1sp3
          Contura Calypso 5.4

          Lord, keep Your arm around my shoulder and Your hand over my mouth. Amen.

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