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alignment between hole and slot with unilateral tolerances

alignment between hole and slot with unilateral tolerances

alignment between hole and slot with unilateral tolerances

(OP)
Hi all,

I need to tightly hold the alignment between a hole and a slot.  The hole has a unilateral postiional tolerance from the tertiary datum and I also want to allow a more generous unilateral tolerance between the slot and hole. The competing priorities I described seem to preclude the use of composite control frame but maybe I'm missing something.

My first attempt at GD&T is attached (mm dims), but it was rejected since I was told I can not GD&T a centerline between features.

Any ideas?
Jim  

RE: alignment between hole and slot with unilateral tolerances

lastviking, I think maybe there's a mix up on terminology.  Assuming you're working to ASME Y14.5M-1994 and have a copy available then take a look at figure 5-41 & the text of section 5.9.

Essentially you can put one tolerance in one direction, and a separate tolerance in another.  I think this will meet your needs.

KENAT,

Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

RE: alignment between hole and slot with unilateral tolerances

(OP)
Thanks Kenat,  that does get me part way there.  Any idea how to utilize unilateral tolerancing with true position?  I don't see that in Y14.5M-1994.

Or do I just need to change my nominal to the center of the unilateral zone and make it bilateral?

RE: alignment between hole and slot with unilateral tolerances

Your latter option is probably the way to go with position tolerance.  

With surface profile you get more options on unequal bi-lateral or unilateral but I don't think it's appropriate here.

KENAT,

Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

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