Positioning Irregular Shaped Feature

[JLang17]

I have an irregular shaped hole that is basically located and sized with tolerances (similar to the shape of this "0" if the left and right sides were flattened). I want to say it can be positioned with a dia. tolerance of .001 at MMC, but my book says I can only apply a positonal tolerance with cylinder, width or spherical features. A profile tolerance doesn't make sense because as the hole departs from MMC, it would break the tolerance zone.

I think I could use a positional tolerance attached to the height and one attached to the width, both with the note "BOUNDARY", but if they're the same tolerance it seems there's a better way.

Any help?

 

[KENAT]

Meant to say, in that case your FCF would be .011 top line .005 bottom line, I'd confused myself.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

http://eng-tips.com/market.cfm?

 

[ewh]

OK KENAT, you can have it all, I'm pretty much through concentrating today anyway ;-)

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]

 

[MechNorth]

KENAT, you lost me on that last post. Say what?

Jim Sykes, P.Eng, GDTP-S
Profile Services

http://www.profileservices.ca

TecEase, Inc.

http://www.tec-ease.com

 

[KENAT]

"JLang17 (Electrical) 12 Feb 09 11:52
Let's say I want to use a profile control for the feature in my original post, and the size tolerances are +-.005. I want to confine the location to a diameter of .001, and allow size to adjust within a zone of .01. How do I show this?
"

It was meant to be corrcting my reply to the above but was still wrong.

The .001 positional doesn't make much sense but I think the OP would want FCF with .006 in the top and .005 in the bottom, but I've lost all faith in myself now.

KENAT,

Have you reminded yourself of faq731-376 recently, or taken a look at posting policies:

http://eng-tips.com/market.cfm?

 

[JLang17]

I figured you meant .006 in the top instead of .011, so it's all good. Thanks for the help.