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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.
Parents
  • IMHO.. whoever drew this did not understand GD&T. I agree the A's & B's could level but the C's would attempt to constrain one of the DOF from A-B. Get clarification of intent from engineering!
  • in reply to Tater
    Well I'll be honest my company has been running these parts for years and years and have never checked those call outs using the target points. But when I took the class is where I first learned what those little bubbles were. So I figured there might be a way to check them the "right" way. The thing is a lot of our casting parts have this dual target point set up. I just wish I knew what to do with the information
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  • in reply to Tater
    Well I'll be honest my company has been running these parts for years and years and have never checked those call outs using the target points. But when I took the class is where I first learned what those little bubbles were. So I figured there might be a way to check them the "right" way. The thing is a lot of our casting parts have this dual target point set up. I just wish I knew what to do with the information
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