R as a basic dimension : General GD&T Questions

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R as a basic dimension

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ansansolis

Post subject: R as a basic dimension

Posted: Fri Jan 07, 2011 7:23 pm

Joined: Fri Jan 07, 2011 7:16 pm
Posts: 1

I have seen R with a value as a basic dimension. Can this be done and if so, when should this be used?
My understanding of basic dimensions is that they are used for location: true position or datum targets.

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joeyd

Post subject: Re: R as a basic dimension

Posted: Mon Jan 10, 2011 5:01 pm

Joined: Fri May 01, 2009 4:26 pm
Posts: 13

A BASIC radius is acceptable when used to define the "true profile" of a surface and used in conjunction with a PROFILE control. See ASME Y14.5-2009, Section 8.2.