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Co-Planar

I have a drawing, for example, calling out datum -A- , co=planar 5 places/surfaces. Then a document/tolerance requirements of :


SO.... on the CMM, do I create -A- off of those 5 places/surfaces.... then create each plane , 5 times, and tolerance the profile for each 5? Thats what makes sense to me.

As you can see; (1a) is just one surface and that surface is to be flat w/.010 (this would NOT come into play with this particular drwg)

(1b) would be 5 surfaces..... and I would think I would establish -A- off those 5 surfaces combined.... then establish 5 seperate surfaces to tolerance each of those with the profile tolerance. Because otherwise how would I get a profile ?

?? Thanks for taking a look!
Parents
  • In this case the profile without a datum reference is basically form control nothing else. Your 1st idea is what I would do based on that but I would inquire with engineering what are they looking for exactly. I believe if you had combined surfaces to make a big A then the print should have had a note saying combined or something similar to that but with today's engineering geniuses you never know. I once showed a print to Hexagon app engineer & after a while the guy said the datum scheme makes no sense.
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  • In this case the profile without a datum reference is basically form control nothing else. Your 1st idea is what I would do based on that but I would inquire with engineering what are they looking for exactly. I believe if you had combined surfaces to make a big A then the print should have had a note saying combined or something similar to that but with today's engineering geniuses you never know. I once showed a print to Hexagon app engineer & after a while the guy said the datum scheme makes no sense.
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