Wierd mins with MAX_INSC

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  • Wierd mins with MAX_INSC

    I am trying to use the MAX_INSC type of circle, and the results are strange (PCDMIS4.2):

    For instance, with a nominal circle of 13.48, I'm getting:
    MEAS - 13.611
    MAX - 13.651
    MIN - 1.962

    1.962?????? This doesn't happen to all circles I'm measuring, some seem quite reasonable, but on most, this is waaaayyyyy off target.

    Any ideas as to why these strange numbers are showing up?

    Plus, what would the min and max show on this, as compared to a LEAST_SQR type of circle?

    TIA

    tweaks
    Any sufficiently advanced technology is indistinguishable from magic... Arthur C Clarke

  • #2
    With MAX_INSC there should be no MIN. The circle is constructed from the three most inward points.

    See what you get from the min and max with least squares and see if that makes sense.
    sigpic GDTPS - 0584

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    • #3
      Thanks! I've been on the horn with Hexagon with on this. I'll pass your input along...
      Any sufficiently advanced technology is indistinguishable from magic... Arthur C Clarke

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      • #4
        Also, why, then, do I get some circles that make perfect sense on the min? For instance, one circle is:

        Nominal: 38.9
        Meas: 38.874
        Max: 38.784
        Min: 38.748

        Why would one look fine and the others whacky?

        TIA
        Any sufficiently advanced technology is indistinguishable from magic... Arthur C Clarke

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        • #5
          Check that last one... That particular circle is MIN_CIRCS. The only weird looking one is the MAX_INSC. Sorry - It's been hours on this one now. ;-/
          Any sufficiently advanced technology is indistinguishable from magic... Arthur C Clarke

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          • #6
            Sorry, I can't explain that one. There is definitely something wrong with the calculations. Send that off to Tech.
            sigpic GDTPS - 0584

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