Feature Control Frame composite vs multiple single segments
Feature Control Frame composite vs multiple single segments
(OP)
Whats the difference in the feature control frame of a composite tolerance vs multiple single segment tolerances? I got this on a drawing and these 2 flatness tolerances are considered Datum A. To me the bottom example feels like it was a mistake by the drafter as most of the drawings that came in at the same time by the same people looked like the above example.





RE: Feature Control Frame composite vs multiple single segments
RE: Feature Control Frame composite vs multiple single segments
Your question is valid, but it's just that the term composite is more for position and profile controls.
RE: Feature Control Frame composite vs multiple single segments
RE: Feature Control Frame composite vs multiple single segments
Given Fundemental Rule 1.4 (m): I thinking the upper frame is the max "free state" flatness effor based on (F) symbol from paragraph 3.3.20 and the lower frame is the max flatness error in a restrained condion that is not defined - at least from the info given. Maybe??
Certified Sr. GD&T Professional
RE: Feature Control Frame composite vs multiple single segments
The single flatness window symbol could mean something. This can be significant when you specify positional tolerances. I would guess that in this application, both are valid and that both mean the same thing.
There should be a note explaining how your datum face is being clamped. Otherwise, your .005 has no meaning.
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JHG
RE: Feature Control Frame composite vs multiple single segments
RE: Feature Control Frame composite vs multiple single segments
I didn't know your use of the term "general refinement" was so particular.