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Tolerance Zone of R is ambiguous 3

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tgwow

Mechanical
Joined
Feb 6, 2007
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18
Location
US
ASME Y14.5m, 1994 Section 2.15.1 Radius Tolerance states:

"A radius symbol R creates a zone defined by two arcs (the minimum and maximum radii). The part surface must lie within this zone...."

Section 2.15.2 Controlled Radius Tolerance states:

"A controlled radius symbol CR creates a tolerance zone defined by two arcs ( the minimum and maximum radii ) that are tangent to the adjacent surfaces..."

How do you connect the two arcs? Because no matter how you do it, there's a zone that is zero wide. Wouldn't you need to connect the two arcs with straight edges? And if you did, wouldn't that be the tolerance zone of CR?

What does the tolerance zone look like for R2+-2?
 
Xplicator,

On the contrary, this has been extremely valuable.
My major issue is this:
If it's difficult to show the tolerance zone of R+/- then wouldn't it be difficult or even next to impossible to verify that your parts are good? Thus, using R without GD&T is no good in practice.

GD&T should be used 99.99% of the time instead of just R+/-

And yes, the original OP which was a starting point has been addressed (Thank you all).

However, to have a better understanding I needed to close all the related issues.
 
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