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MMC on a Surface

MMC on a Surface

MMC on a Surface

(OP)
i have a situation i am trying to resolve. my blue print has a callout of a diameter true position rel to -C- and -B-. both of them are surfaces and the geometrical feature control has a modifier for MMC on both datums. they are outside surfaces, so would i get more tolerance with the surfaces being smaller or larger ???
thanks
JJ

RE: MMC on a Surface

(OP)
yeah, but i don't know how to apply the tolerance
thanks

RE: MMC on a Surface

A sketch or more detailed description of the blueprint would really help. Without it it is really hard to say whether the callout is legal or not. According to which dimensioning standard is the drawing?

RE: MMC on a Surface

(OP)
this is the scoop guys.... i can not get my hands on a copy of anme y14 at the moment. the drawings states interpretation per asme y14.5m-1994
any help would be grateful

RE: MMC on a Surface

If the drawing follows ASME Y14.5M-1994 then I would say such callout is illegal.

Application of (M) or (L) modifiers on datum features that are surfaces was introduced only in Y14.5-2009. Are you sure that location of datum feature symbols is indicating surface elements as datum features and not features of size for instance?

RE: MMC on a Surface

I am with pmarc, material modifiers on surface datum features was not defined in the 1994 standard and may have been actually prohibited.
Frank

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