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Cylindrical Tolerance Zone

Cylindrical Tolerance Zone

Cylindrical Tolerance Zone

(OP)
A customer has submitted numerous drawings where ASME Y14.5M-1994 is referenced.  They use the Ø symbol for a cylindrical tolerance where a plane feature being controlled. I would like to know if  the  Ø symbol appropriate.  Example:
Perpendicular |    Ø .005 |A

Datum A is a cylindrical feature, but the feature being controlled is a plane surface.  

Thanks,
Chuck

RE: Cylindrical Tolerance Zone

As described, the diameter symbol should indeed be omitted.

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

RE: Cylindrical Tolerance Zone

One should not use a diametrical tolerance zone on any feature that is not round or cylindrical. It should not be used on a plane or surface requirement.

Your example of perpendicularity with a diametrical tolerance zone is appropriate if the feature is a round hole or pin. If the feature is not round, it shouldn't be used since one would lose orientation.

I would suggest contacting your Customer and ask a few questions playing dumb. Try to get their requirement needs and then applying it to a marked up drawing.

Dave D.
www.qmsi.ca

RE: Cylindrical Tolerance Zone

(OP)
Thanks for the quick reply.  I was pretty sure, but wanted to have a second or third opinion before contacting our customer.
Chuck

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