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i need help with a big part with iterative

pcdmisstudent
Hey guys
so i have this big part, that the datums are defined by 3 datums points (three holes with sample hits that i did iterative with). I then constructed three theorietical planes (alignment planes) and defined those as ABC. Then i measured all the different features on the parted and called them out using FCF position.
the program works well, but some of my results gets weirdly high.
Ill upload pics with the datum targets (see black circles)
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  • Hm, ok. I am leaning more and more towards Matt's solution, because the datum targets are not... well.

    A1B1C1 and A2B2C2 as circles with sample hits on the outside surface.
    Create 3D-line between them and primary alignment in Y-axis (note the is direction is correct according to drawings trihedron).
    Create a midpoint between them, XYZ origin here.
    A3 as circle with sample hits.
    Create offset line between A2B2C2 and A3, the offset value shall be 22.
    Make sure the line is on the left side of A3 when viewing the part in the drawing view (like the left snippet above).
    Secondary alignment in Z using the offset line, around Y.
    Done.

    The drawing is flawed when it comes to datum [C] and the datum target definition. This needs to be adressed to the designer.
  • in reply to vpt.se
    In this case, if you have been aligning to the two bottom holes so they are concentric, I'd most likely believe your numbers in this case.

    Do you have something during drilling that secures that the surfaces doesn't move while drilling? (mothåll)
    It might be springback that causes the offset.
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  • in reply to vpt.se
    In this case, if you have been aligning to the two bottom holes so they are concentric, I'd most likely believe your numbers in this case.

    Do you have something during drilling that secures that the surfaces doesn't move while drilling? (mothåll)
    It might be springback that causes the offset.
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