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2-2-2 iterative alignment

juliansegura
Hi everybody,

Let me start off by saying I just took the hexagon 201 course so I am trying to get more familiar with it here at work.

At my company we work with a lot of castings. They usually use datum targets to identify datum A, B, and C. I Have attached a part I am currently working on with the relevant information. As you can see it has two points for A, two for B and two for C. How would you use these points for an iterative alignment? As far as I have read through the forums I've only seen examples with the 3-2-1 method. When I try using 2 points to level it just give me a message saying I need 3 points. I have seen on the pcdmis website a table saying I could use 3 circles in DCC mode but not much more information on that.

Thank you for your help.
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  • Maybe do the alignment as a normal alignment, rather than iterative.

    Looks like A1 and A2 make an origin line.

    B1 and B2 look to be an origin line. Probably use this as the rotation.

    C1 and C2 look to be an origin line.

    Looks like somebody has an unorthodox understanding of casting datums.

    As Matthew said, the ABC feature control frame should be used to 'hand off' the datum scheme from the casting to the first in-process cuts and their new datum scheme.
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  • Maybe do the alignment as a normal alignment, rather than iterative.

    Looks like A1 and A2 make an origin line.

    B1 and B2 look to be an origin line. Probably use this as the rotation.

    C1 and C2 look to be an origin line.

    Looks like somebody has an unorthodox understanding of casting datums.

    As Matthew said, the ABC feature control frame should be used to 'hand off' the datum scheme from the casting to the first in-process cuts and their new datum scheme.
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