GD&T Positional tolerances
GD&T Positional tolerances
(OP)
Can you have a positional tolerance feature control frame on a hole without referance to any datums? If this is a correct way of dimensioning, then what is it controling? Perpindicularity, hole to hole, something else?





RE: GD&T Positional tolerances
I had a quick look in 14.5 and a simple answer didn't jump out at me, so maybe I'll leave this one to others unless I get a bolt of inspiration.
I'd normally expect at least a single datum called out to give perpendicularity but like I said, didn't find a concise explanation in a quick flick through section 5.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: GD&T Positional tolerances
As to your question, I see no purpose of a positional tolerance unless it is relative to something.
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RE: GD&T Positional tolerances