Profile of a Surface 1

[James Orlando]

I'm hoping someone can help me answer the correct meaning of the Profile of a Surface call out is on this drawing. We have two individuals with differing opinions and I would like to understand the true intention.

The part has an overall dimension of 220.12. The side surface (B) has Profile of a Surface of 0.25 mm.

Does this mean that the overall dimension would be +/- 0.5 mm or +/- 0.25 mm?

Thank you in advance for the help.

 

[Belanger]

There you go, Evan. Using that wording from 1.4(a), they see a basic dimension as an "indirectly toleranced" dimension. Still ugh.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

 

[semiond]

I think i might have an explanation.
1.4 (a) implies that the tolerance can be applied directly or indirectly using a basic dimension and a geometric control such as surface profile.
Once the tolerance zone defined, the feature is considered "directly toleranced", according to para. 2.2 (c).
Confusing, but not contradicting.
Therefore it is probably OK that a feature of size will be defined through a basic dimension and profile of a surface.