ISO question 2

[Andera]

Ø 60.5 ± 0.25 GN shaft / outside feature specification
The specification applies to:
A.) upper limit of the cylindrical surface
B.) lower limit of the cylindrical surface
C.) both upper and lower limits
d.) neither specification

Will the answer change if the specification is based on ISO 286-1 (a.k.a ISO codes H7, h10, etc)?

 

[pmarc]

The answer is C.

From ISO 14405-1:2016:

 

[Andera]

Thank you very much pmarc.
Interesting enough is that I have 14405-1 and seen the picture you posted, but for some "unkown" reason (read lack of ISO education and experience) I wrongfully assumed that the spec is applied to both limits only when the default GG (least square) operator is used.

 

[greenimi]

Interesting enough, according to pmarc's post from 31 May 19 20:41 even if GN applies to both upper and lower limits, the specification is NOT complete.
Copy-paste: "Size callout with GN modifier will only control how big/small the envelope circumscribed about that external feature can be, but it will not have a power over controlling the depth of the saddle"

https://www.eng-tips.com/viewthread.cfm?qid=454109

Ø 60.5 ± 0.25 (only local size is defined = two-point size, and not global size)
Ø 60.5 ± 0.25 GN (only global size is defined and not the local size)
Ø 60.5 ± 0.25 GN LP (same as E) - (both local size and global size are defined)
(no wondering why rule#1 is default in ASME )


Is my understanding correct?
Am I missing something?