Unequally Disposed Profile 2

[engiNERD77]

Could someone please explain this modifier for me ....like I'm a 3 year old? What exactly is my worst case scenario?

 

[JNieman]

That would be an "Unequally Disposed Profile Symbol" which becomes a unilateral profile, since it's a tolerance that only adds material from the nominal. It creates a tolerance zone of .008 units in size, starting at the nominal and extending .008 units away from the nominal surface in the "adding material" direction.

I do not believe there should be a vertical line preceding the second .008 - that's all part of the same 'box' / 'definition' with the (U) symbol.

That is, of course, coming from 2009 of Y14.5 since it's the one I'm most familiar with. Others may vary.

For the 3 year old:

That's a camel's back symbol! The camel's back means the part gets a BIG HUMP on it that's EIGHT BIG!. It can't get smaller because the camel will get sick but the camel can get a hump that's 8 big! Bigger than 8 and he might POP! And that'd be bad. We don't want the camel to get sick OR to pop ! We like the camel when his hump is flat or up to 8 big.

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NX8.0, Solidworks 2014, AutoCAD, Enovia V5

 

[engiNERD77]

Lol thanks for the clarification.

 

[powerhound]

JNieman is correct on all counts. It means the tolerance zone extends outwards from the true profile so any variation results in extra material. There should not be a vertical bar after the circle U and the second appearance of the .008. This is new to the 2009 standard. It does not appear in the 1994 standard. It did, however, originally appear in ASME Y14.41-2003.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
SSG, U.S. Army
Taji, Iraq OIF II