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Issues w/ Profile of a Surface

rbronson87
Hi,

I'm having an issue with profile of a surface using Xact Dimensioning on a Romer arm If there's not datum called out in FCF the part passes no problem, if there's one Datum called out the part passes no problem but multiple (two datum) and my part starts to fail by huge margins (+- 0.300"). I've tried to correct this issue on multiple, unique parts but have had the same issue with the dimension failing, considerably (the dimensions are very passable, FCF tolerance is .060 for a laser cut part).

I'm wondering if there's something (most likely) that I did in my programming, a rookie mistake, or something that I'm missing. I align, define datums and take points using a CAD model.

Is it possible I'm having issues with the vectors being controlled by the second Datum?

I will happily post code, pictures, etc. if that will help.

thank you for your support!
Parents
  • Profile with no datum reference frame called out? Form only.

    Profile with a datum reference frame called out that doesn't restrict all 6 degrees of freedom? Form is checked and location is checked, the partial datum reference frame allows the data to slide in the degrees of freedom not constrained.

    Profile with a datum reference frame called out that restricts all degrees of freedom? Form is checked and location is check, data is not allowed to slide to fit.

    (PS: if you have the latter two situations, but only want a form check and not location check, then you can adjust that via the Advanced Tab)
    (PPS: from the same advanced tab, you might want to activate your CAD graphical analysis and see where the problem spot it. I have frequently had my FindNoms tolerance incorrectly set, and was scanning near an edge. I thought the nominals were being pulled from the surface I was touching, but since I had the FindNoms value (under F5) set too large, I saw that the noms were being pulled from the wrong surface. But I only realized this by activating CAD G.A. and looking at the picture. Maybe you should post that)
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  • Profile with no datum reference frame called out? Form only.

    Profile with a datum reference frame called out that doesn't restrict all 6 degrees of freedom? Form is checked and location is checked, the partial datum reference frame allows the data to slide in the degrees of freedom not constrained.

    Profile with a datum reference frame called out that restricts all degrees of freedom? Form is checked and location is check, data is not allowed to slide to fit.

    (PS: if you have the latter two situations, but only want a form check and not location check, then you can adjust that via the Advanced Tab)
    (PPS: from the same advanced tab, you might want to activate your CAD graphical analysis and see where the problem spot it. I have frequently had my FindNoms tolerance incorrectly set, and was scanning near an edge. I thought the nominals were being pulled from the surface I was touching, but since I had the FindNoms value (under F5) set too large, I saw that the noms were being pulled from the wrong surface. But I only realized this by activating CAD G.A. and looking at the picture. Maybe you should post that)
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