【转帖】position tolerance usage

yang686526

position tolerance usage
does anyone know, postion tolerance usage tips.
for example i know using for hole positioning.
but attached symbol used for surface, what does it mean?
best regards.
some info:
cascadco, take a look at some of the links chris gave you.
in y14.5, the position characteristic controls extracted geometry of "features of size":
-axis of a cylinder
-centerplane of a slot or slab
-center point of a sphere
that's it.  there is no application of position to surfaces.  location control of surfaces is accomplished using surface profile.
evan janeshewski
axymetrix quality engineering inc.
this fcf would almost certainly have to be located under a toleranced dimension. i can't think of an instance where an arrow would point to a feature and this be legal. in fact, i can't think of an instance where you would reference 3 datums and not have a diameter symbol preceding the tolerance value. maybe it's just sort of late and i'm not thinking enough.
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