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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
  • Thanks for the help. We used vector points and have had some success. Finally!

    We think we are having some probe comp issues that are contributing to the failure.
    How sensitive is the arm when taking vector points, what degree from perpendicular or parallel is acceptable?

    Yes, thank you for the help.

    Just incase anyone runs across the same learning experience:

    Autovector us Vector Point to produce a profile of a surface (it works really well).
    Find Noms in the Vector Point menu make sure Find Noms is selected in the drop down menu.
    Vectors after taking points if your parts are way off check the vector, or retake the individual point (which is an option in the vectory point menu opened up by right click and editing the specific point in question.) You can inverse the Vector in the menu as well.
    Auto Trigger use it for profile of a surface, its great.

    Thank you for the help.
Reply
  • Thanks for the help. We used vector points and have had some success. Finally!

    We think we are having some probe comp issues that are contributing to the failure.
    How sensitive is the arm when taking vector points, what degree from perpendicular or parallel is acceptable?

    Yes, thank you for the help.

    Just incase anyone runs across the same learning experience:

    Autovector us Vector Point to produce a profile of a surface (it works really well).
    Find Noms in the Vector Point menu make sure Find Noms is selected in the drop down menu.
    Vectors after taking points if your parts are way off check the vector, or retake the individual point (which is an option in the vectory point menu opened up by right click and editing the specific point in question.) You can inverse the Vector in the menu as well.
    Auto Trigger use it for profile of a surface, its great.

    Thank you for the help.
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