Question on ISO hole pattern 3

• Nov 8, 2022

• #2

Belanger

Automotive

Oct 5, 2009

2,448

CZ means common zone, which only makes sense for in-line (coaxial) holes.

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

 

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• Nov 8, 2022

• Thread starter
• #3

SeasonLee

Mechanical

Sep 15, 2008

912

JP

Thanks for your comment, but I know CZ modifier need to be used when not all non-redundant DOF are fully locked. pls see the figure below.

Season

 

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• Nov 8, 2022

3
• #4

pmarc

Mechanical

Sep 2, 2008

3,168

SeasonLee,

ISO 5458:2018, para. 5.4.4, says this:
"In the case of a multiple pattern specification defined with the SIM modifier:
— the individual geometrical specification shall not include the CZR modifier;
— the individual geometrical specification can include the CZ modifier, but this is superfluous and may be omitted."

J-P,
A few years ago ISO GPS changed the meaning of CZ from Common Zone to Combined Zone. I think the latter name better reflects the intent of the modifier, which is grouping of multiple tolerance zones regardless if they are in-line or not.

 

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• Nov 8, 2022

• #5

Belanger

Automotive

Oct 5, 2009

2,448

Makes sense -- thanks

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

 

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• Nov 8, 2022

• Thread starter
• #6

SeasonLee

Mechanical

Sep 15, 2008

912

pmarc said:

— the individual geometrical specification can include the CZ modifier, but this is superfluous and may be omitted."

Click to expand...

Oh, My bad, I missed this. Thank you.

Season

 

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