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I keep running into these situations where the engineers want to designate a datum target point at a section of a hole. Say the hole is 1 inch deep, at .500 inches they want to use the centerpoint of that section as a datum target point. I can't seem to wrap my head around how this point...

The question came up to me if it was allowed to attach a profile FCF to a Basic dimension. In ASME Y14.5 -2009 - 8.3.1.1, it clearly states that it must be directed to a surface or extension line. But why is that statement only mentioned in 8.3.1.1 ? why is it not repeated in 8.3.1.2 ? Is...

Thanks for all the replies...the other post was really helpful as well. I feel like I have an answer so I'll sum up my thoughts to all the posts. Garland23...sorry should have mentioned...this ASME Y14.5 donatim24...In my real world situation I have a BASIC dimension that is giving the...

I have a feeling this is a basic question, but I have always wondered it. A profile tolerance zone boundary looks exactly like the surface, just offset by the value, but what happens at the extents of the boundary? does the boundary stretch and contract to match the actual part? if a part is...

arrgg...thank you pmarc. I guess I got so used to skimming thru these paragraphs, I completely never saw that. read it a 1000x but I guess it never sunk in. Thank you!!!

Is it possible to mix datum features and datum target points/lines in a single Datum Reference Frame? Can my primary datum be a planar face, can my secondary datum be another planar face, and my tertiary datum be a single Datum Target point C1 ? I don't see anything in y14.5 that supports this...