Form only

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  • Form only

    Hello,

    We have to measure Position and Form of a sheet metal surface.
    In order to do this, we measure Position by picking the surface and by dimensioning the position of the point. When we want to obtain the Form of the surface we click on the "Form of a surface" icon.
    It appears the window, where we choose "Only form" and "Best fit" options, and a set of points to evaluate.

    The result in this case is a list of Dimensions, each one started with "M" where the deviation is equal to zero. It is not possible because we are working with a real workpiece who has deviations.

    Could anybody explain me how to use it.

    Sorry for my english and thanks in advance.

    Martin Frattini

  • #2
    Are you picking a point? A point has no form.

    Craig
    <internet bumper sticker goes here>

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    • #3
      no, I am choosing a set of points, maybe 10 or 20 points depending on the "matchin patch" of the workpiece.

      Martin Frattini

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      • #4
        What craiger_ny said.

        Martin, just wanted to write back to tell you not to worry about your english skills. You write better than most of us on the forum.

        If you have some more details that could help us out, perhaps then I could be of assistance.
        sigpic

        James Mannes

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        • #5
          This "set" is it a feature set or individual points? I do believe if you pick say 5 individual points you get 5 individual dimensions. Each dimension is for each point exclusively. Perhaps I am wrong I've never tried it.

          Craig
          <internet bumper sticker goes here>

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          • #6
            Originally posted by metrologia View Post
            no, I am choosing a set of points, maybe 10 or 20 points depending on the "matchin patch" of the workpiece.

            Martin Frattini
            How are you constructing this set? Is it a "patch" scan?
            sigpic

            James Mannes

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            • #7
              no it isnt a patch scan

              I make it as follows:
              1. I align the workpiece.
              2. I measure 10 "vectorial points" on the surface I am interested in.
              3. I pick the "Profile of a surface" icon.
              4. It appears the window, where we choose "Only form" and "Best fit" options, and a set of points to evaluate.
              5. The result in this case
              is a list of Dimensions, each one started with "M" where the deviation is equal to zero.

              I hope it helps.

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              • #8
                Individual points do not have form. Hang in there I think we might have a communication gap but don't blame yourself your English is good.

                What you are getting is one dimension for each point. You have a series of points not a "set" of points. At least that is what the dimension dialog box is seeing. To create a "feature set" is a different operation. Just picking a group of points in the dimension dialog does not make it a "set".

                Craig
                Last edited by craiger_ny; 12-01-2006, 02:41 PM.
                <internet bumper sticker goes here>

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                • #9
                  For a quick evaluation - try constructing a best fit plane out of those points then do the profile form only...otherwise I'm sure one of the guys her will have a more thorough response using set of points.

                  Joe
                  PC-DMIS CAD++ 3.7 from 4.2 MR1

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                  • #10
                    well, if I am getting dimensu¡ions for individual points, how have I to use the"Profile of a surface"option?

                    help!!!!!!!!!!

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                    • #11
                      Martin,
                      Craig is directing you down the correct path.
                      sigpic

                      James Mannes

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                      • #12
                        Shouldn't he use those 10 to 20 points and CONSTRUCT A SURFACE? Then dimension the surface profile of that constructed surface like he tried to do with the individual points?
                        sigpic
                        all throttle

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                        • #13
                          I mean consruct a PLANE, not a surface. Same but different 'eh?
                          sigpic
                          all throttle

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                          • #14
                            I have never done profile of a feature set. Can he do a feature set of those points and dimension that?
                            <internet bumper sticker goes here>

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                            • #15
                              What you can also do is dimension each point from reference (from axis where it lies) and look at deviation from nominal take max and min should show profile of surface sort of like form.
                              PC-DMIS CAD++ 3.7 from 4.2 MR1

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