Position of a Hole to a Plane

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  • Position of a Hole to a Plane

    I'm having a problem understanding how can you call out the position of a hole to the plane in which it resides. For instance, Datum A is the surface of a plate. The print then calls out a position to a hole drilled in the plate back to the plate surface. How can the hole be anywhere but the surface it's called out to? Thanks.

  • #2
    Datum's constrain degrees of freedom. In this case, the plane is controlling the perpendicularity of the hole axis.
    PC-DMIS 2015.1, SP10, CAD++
    Global 7/10/7, 5/5/5
    Renishaw PH10MQ, PH10M, TP200

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    • Jim Poehler
      Jim Poehler commented
      Editing a comment
      Yup! Machining 101, at its finest. And to think they thought they'd made a sphere. LOL

    • Max Tasty
      Max Tasty commented
      Editing a comment
      I'm kind of partial to the squircle as an auto feature. It sure would help with them pesky slots manufacturing sometimes struggles with. ;-)

    • VinniUSMC
      VinniUSMC commented
      Editing a comment
      All hail the mighty squircle.

  • #3
    True. But technically the feature is the entire surface of it, not a portion of it. I realize that that doesn't always translate to what people actually measure.
    PC-DMIS 2015.1, SP10, CAD++
    Global 7/10/7, 5/5/5
    Renishaw PH10MQ, PH10M, TP200

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    • #4
      I agree with both statements, probably should have been a politician. I've seen this in other prints and always thought this was a meaningless. Thanks for input, appreciate it.

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      • #5
        Also be aware, if the call out is to more than one hole (i.e. 6 x Ø10.0) then it's also controlling the holes to each other.

        This is the more common case where you get Position callouts to a single datum.

        Automettech - Automated Metrology Technology

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        • #6
          Bad callout, I fart in these engineers general direction. If you want perp, put a perp callout.
          PC-DMIS CAD++ 2o19 R1 SP11

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          • KIRBSTER269
            KIRBSTER269 commented
            Editing a comment
            How dare you question the superior mind of an engineer?

          • VinniUSMC
            VinniUSMC commented
            Editing a comment
            Except that they are literally the exact same thing, so what difference does it make?

        • #7
          I agree, why not put a Perpendicular call out instead of a Position to the plane?

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