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Plane, Circle, Width Alignment ???

RIDER
I have gained so much over the years from the contributors of this forum. Thank y'all for sharing your wisdom, knowledge, and experiences!

With that said, I would like your opinions on the attached crude drawing. It's third angle projection and in accordance with ASME Y14.5M-1994. The material at it's thickest point is 1 1/4". The total length of the part is 60". Here are the questionsRelaxed

1. How would you align this part for the position and profile call-outs back to ABC?
2. Since B is a huge diameter and C is a width, what would you use to rotate to?
3. PC-DMIS can't solve a constructed line from a circle/cylinder (B) to a width/mid-line/mid-plane (C). So what would you use instead to comply with the standard and satisfy the software?

There's some dissension here with regard to designer intent as well as compliance to the standard.

Thank y'all again for taking the time to share!!!
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  • As a radius, B has a center point. Clocking then is from B (center point) to C (the midplane/line/point of the feature of size C).
  • in reply to VinniUSMC
    Regardless of whether your origin is 14 feet away or not, that is Datum B. The only thing Datum C can do, that isn't already done (can/may/must) is stop rotation about B (or, think of it as rolling the part on the surface that B is pointing at.)

    Search the forum for the instructions for the best practice for measuring a small arc radius.

    Datum C is the midplane of the feature, at whatever size the feature is.

    This is equivalent to any other plane, circle, slot alignment.
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  • in reply to VinniUSMC
    Regardless of whether your origin is 14 feet away or not, that is Datum B. The only thing Datum C can do, that isn't already done (can/may/must) is stop rotation about B (or, think of it as rolling the part on the surface that B is pointing at.)

    Search the forum for the instructions for the best practice for measuring a small arc radius.

    Datum C is the midplane of the feature, at whatever size the feature is.

    This is equivalent to any other plane, circle, slot alignment.
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