Reporting Sphericity

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  • Reporting Sphericity

    im not finding a way to report Sphericity in pc-dmis
    i need to evaluate the form of a sphere. am i just missing it ?

  • #2
    "The Insert | Dimension | Circularity menu option determines the roundness of a circle, sphericity of a sphere or the conicity of a cone."

    Per the PCDMIS help file.

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    • InspectorJester
      InspectorJester commented
      Editing a comment
      I had imagined it would be a Circularity dimension, but I was not able to research or provide any facts...
      +1

  • #3
    the best thing i have come up with is to measure a sphere, datum it x,y,z then report the center point distance to each point measured around the sphere.
    thoughts ?

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    • #4
      Originally posted by gibsonridge View Post
      the best thing i have come up with is to measure a sphere, datum it x,y,z then report the center point distance to each point measured around the sphere.
      thoughts ?
      Or you could use circularity which will check the sphericity of the sphere as Sora5 mentioned. I've tried it and it works.
      PC-DMIS 2016.0 SP8

      Jeff

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      • InspectorJester
        InspectorJester commented
        Editing a comment
        Have you tried it?

      • gibsonridge
        gibsonridge commented
        Editing a comment
        yes , and im still tinkering trying to get the best definition , to give the operator the best definition of true form.

      • gibsonridge
        gibsonridge commented
        Editing a comment
        when viewing the graphical it appears to be evaluating the circularity of a diameter (2D) in the current working plane only.
        i need to see the error in a 3D , basically im trying to check a qual sphere.

    • #5
      You can dimension the Form only of the sphere and even show it graphically if so desired
      Michael A Wildschutz Sr
      I Walk on The WildSide
      "To Each is Own"

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      • Mike Ruff
        Mike Ruff commented
        Editing a comment
        What type of probe are you using? If it's a TP20, I highly doubt you'll be able to get down to .0004" Form because the springs cause error, so I switch out the TP20 for the scanning head here when I need very high accuracy

      • gibsonridge
        gibsonridge commented
        Editing a comment
        tesa Star leitz scanning head,
        i found that a two mm probe is giving me the best results. ( proofing it all out on my qual sphere.)
        reporting profile of a surface - form and location checking at .000027" on cmm qual sphere

      • InspectorJester
        InspectorJester commented
        Editing a comment
        Well done!

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