Angularity

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  • Angularity

    Can someone please help me understand how PC-DMIS calculates angularity. I'm checking the angularity between two lines that are called out at 45 degrees and the angle is measuring 44.89 which is well within spec. The angularity callout is 6.3 but on the legacy angularity dimension it is giving me a measured value of 35.001. ????

  • #2
    Switch graphical analysis on to see what's happening
    Automettech - Automated Metrology Technology

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    • #3
      Angle tolerance zone is pie shaped. Angularity tolerance zone is two parallel lines XX distance apart, centered on the nominal angle.

      Knowing the angle measurement doesn't tell you whether angularity is good or not.

      Basically, it's just a surface profile at a basic angle from the datum. The surface could be wavy, or off angle.
      "This is my word... and as such is beyond contestation."

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      • #4
        I am thinking the angularity result will be directly affected by the length of the line being measured.
        The angularity measurement of a 1.000" line deviating -0.11 degree is less than the result of 2.000" line deviating -0.11 degree.
        Angularity of 6.3MM on a "short" line could be a very large angle change.....

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        • VinniUSMC
          VinniUSMC commented
          Editing a comment
          You are correct.

      • #5
        I had to explain this to someone recently. They were not understanding a thing until I said its the same a perpendicularity but at any angle you need ? Perp is just angularity that happens to be applied to only a 90°.

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        • #6
          I would check the workplane...
          35 mm of angularity shouldn't result of a machining defect (except if the operator has drink too much !), I think it's a construction error...

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          • feed_my_head
            feed_my_head commented
            Editing a comment
            I agree. Workplane and the correct alignment (unless you're doing 2 planes in 3D, then I would have to think on it...)

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