Circled Y

[Belanger]

I'm working with a drawing that follows ISO, and they have a profile tolerance with a circled Y after the tolerance number. Does anyone know what that means in ISO? It's not in any reference that I have access to right now.

There are actually two profiles: the upper tolerance frame has 1 mm with respect to datum B, and the lower tolerance frame has 0.4 (Y) with respect to the same datum B.

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

 

[powerhound]

I once got all caught up in an explanation for a circle E that I saw on a print at a customers plant. I went on and on about the envelope principle and what it meant in the context of the dimension it was associated with, when a student raised their hand and said "That's indicating the change made for rev E." I was totally embarrassed.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech