Line Profile and Bestfit

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  • Line Profile and Bestfit

    Hey Folks,
    I have posted about this before, but I am still a bit unsure of how I am dimensioning this.

    See the attached:





    My question: Should I be bestfitting using the Z axis or something else?
    Last edited by John Riggins; 09-20-2007, 12:59 PM.
    Lately, it occurs to me
    What a long, strange trip it's been.

    2017 R1 (Offline programming)

  • #2
    You want to use the Y workplane so you can get the deviation in the X and the Z.
    Bill Jarrells
    A lie can travel half way around the world while the truth is putting on its shoes. - Mark Twain

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    • #3
      You may not want to best fit at unless your FCF calls for it. What does the callout say about the profile. Bestfitting "jiggle-fits" the datums to minimize the error. If the profile has no datum reference, then bestfit in Y+(or Y-).
      Links to my utilities for PCDMIS

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      • #4
        What C wrote. What does your FCF exactlt look like?
        ***************************
        PC-DMIS/NC 2010MR3; 15 December 2010; running on 18 machine tools.
        Romer Infinite; PC-DMIS 2010 MR3; 15 December 2010.

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        • #5
          Originally posted by cmmguy View Post
          You may not want to best fit at unless your FCF calls for it. What does the callout say about the profile. Bestfitting "jiggle-fits" the datums to minimize the error. If the profile has no datum reference, then bestfit in Y+(or Y-).
          Certainly do this.
          My response was based on the assumption that you 'wanted' to bestfit.
          Bill Jarrells
          A lie can travel half way around the world while the truth is putting on its shoes. - Mark Twain

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          • #6
            I think the values with the Z workplane bestfit are correct.
            I don't believe this surface is as good as the Y bestfit makes it look.



            ?
            Last edited by John Riggins; 09-20-2007, 12:59 PM.
            Lately, it occurs to me
            What a long, strange trip it's been.

            2017 R1 (Offline programming)

            Comment

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