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Hole referencing a perpendicular plane
I am trying to analyze a drawing and cannot make sense of a true position datum on a hole. It is referencing a perpendicular center plane bisecting two surfaces that are dimensioned from the hole itself. I think there are multiple things wrong with doing it this way, and I cannot link the original drawing, so I have attached analogous example. I really am not sure how to make it "correct." so any advice would be helpful.
[IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1759&stc=1[/IMG]