MAX value given but also a general tolerance

[Heleas]

Hello, if the value MAX 12 is given but you also have a general tolerancing on the drawing like ISO 2768mk, do you give the MAX12 a -0,2 tolerance or it can go to "zero"?

 

[greenimi]

Is your ISO2768mK indicated with unless otherwise specified? If yes, then I would argue that MAX12 will take precedence.
So the upper tolerance value is defined.
The lower tolerance value, since it is NOT defined by MAX 12, I would say it is defined by the ISO2768-mK. That is my opinion.
But I say maybe there are other people around that argue that the lower limit is NOT defined (incomplete definition)

I would slso say that (to answer directly the OP question) that you do not give MAX12 a -0.2 tolerance for its upper size limit.

 

[MintJulep]

12 Max.

Cannot be greater than 12.

Can be 12.

Can be any value less than 12.

 

[Belanger]

Don't go to the general tolerance. The minimum for that spec would just be zero.
In the ASME Y14.5 standard, paragraph 5.5 covers the idea (I know you mentioned ISO, but I don't have the ISO docs in front of me.)

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

 

[jassco]

I agree with MintJulep.

There is only a USL (Upper Specification Limit) which is 12. There is no LSL (Lower Specification Limit), not even a zero, because it (LSL) would not be evaluated.

Best regards,

Alex

 

[Belanger]

There is no LSL (Lower Specification Limit), not even a zero, because it (LSL) would not be evaluated.

From paragraph 5.5 of Y14.5: "The unspecified limit can be zero or approach infinity without resulting in a condition detrimental to the design."
So one could say that there is a theoretical limit of zero, but I agree that it wouldn't be evaluated/reported.

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

 

[Heleas]

Thanks for everyone who replied!