USE OF "ALL AROUND" CIRCLE SYMBOL
USE OF "ALL AROUND" CIRCLE SYMBOL
(OP)
I have been using this all around symbol for profile only (as was mandated in 1982 Y14.5) but was reminded by a colleague that para 3.3.18 of the 1994 Y14.5 dropped the word profile out of the paragragh, thus opening it up to be used for such things as radii or chamfers all around.
I am curious as to what the rest of you are doing regarding this. Do you use the circle on the leader bend for radii, chamfers and the like?
I am curious as to what the rest of you are doing regarding this. Do you use the circle on the leader bend for radii, chamfers and the like?





RE: USE OF "ALL AROUND" CIRCLE SYMBOL
RE: USE OF "ALL AROUND" CIRCLE SYMBOL
So I’d say as defined here it only applies to tolerances (I added the caps), not explicitly to the dimensions them selves.
As such I’m not sure that technically this paragraph does really apply to chamfers etc.
However, I can see the usefulness for using it on the applications you describe.
I’ve seen it on weld symbols, not sure if AWS??? explains its use in this context.
KENAT, probably the least qualified checker you'll ever meet...
RE: USE OF "ALL AROUND" CIRCLE SYMBOL
3.3.18 is identical to the old para 3.4.2.3, of 1982 version minus the word "profile", so I think I am right in not wanting too use it for other non-FCF features as my colleagues are doing.
RE: USE OF "ALL AROUND" CIRCLE SYMBOL
I'd be inclined to agree with you.
KENAT, probably the least qualified checker you'll ever meet...
RE: USE OF "ALL AROUND" CIRCLE SYMBOL
(a) An appropriate view or section is drawn showing the desired basic profile.
(c) Where a profile tolerance applies all around the profile of a part, the symbol used to designate “all around” is placed on the leader from the feature control frame.
6.5.2 Tolerance Zone.
(a) Profile of a Surface. The tolerance zone established by the profile of a surface tolerance is threedimensional, extending along the length and width (or circumference) of the considered feature or features. This may be applied to parts having a constant cross section as in Fig. 6-12, to parts having a surface of revolution, or to parts (such as castings) defined by profile tolerances applying “ALL OVER” as indicated below the feature control frame.
6.5.1(a) would indicate that the profile is orientation dependant - i.e. the view in which it is placed controls the limits in that direction only, with (c) applying to the entire perimeter of the indicated shape.
6.5.2 might be better applied to compound curvatured surfaces and for generic "ALL OVER" applications
RE: USE OF "ALL AROUND" CIRCLE SYMBOL
RE: USE OF "ALL AROUND" CIRCLE SYMBOL