Name for Other Zone 2

[axym]

Hi All,

Here's a fun one.

If the place that the feature is allowed to be in is called the "tolerance zone", what should we call the place that the feature is not allowed to be in? Functional gage components, for example, would occupy this other place.

I have a couple of possibilities, but I'm wondering what others think. Any ideas come to mind?


Evan Janeshewski

Axymetrix Quality Engineering Inc.

http://www.axymetrix.ca

 

[CheckerHater]

Isn't it already called "envelope"?

 

[axym]

CH,

As far as I understand, an envelope is something different. It's a zone that the as-produced feature fits into, like an actual mating envelope.

Evan Janeshewski

Axymetrix Quality Engineering Inc.

http://www.axymetrix.ca

 

[Belanger]

If the place where the feature can lie is the tolerance zone, then the place where the feature cannot lie is pretty much the rest of the universe

couldn't resist

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

 

[PaulJackson]

"O" zone... aka "OTOL"

 

[MintJulep]

Outside of the tolerance zone.

 

[weavedreamer]

"In"tolerable comes to mind.

 

[axym]

JP,

I agree that the place where the feature must not lie can be pretty big. It really is the rest of the universe.

There are also cases where the tolerance zone is most of the universe, and there is only a small volume where the feature is not allowed to go. One example is a Position tolerance referenced at MMC for a hole, that defines a virtual condition boundary that the surface is not allowed to violate. The tolerance zone is the infinite volume outside the VC boundary, and the "other place" is the relatively small finite volume inside the VC boundary.

If the feature extends outside of the tolerance zone, past the boundary, then it's ... out of bounds?

Evan Janeshewski

Axymetrix Quality Engineering Inc.

http://www.axymetrix.ca

 

[Belanger]

Well, in your original question were you thinking of just one tolerance, or all the tolerances imposed on a feature? Because you're right; with the VC boundary idea there is only the requirement that it not violate the boundary; beyond that it could be all over the place. But we'd have to assume that there is another tolerance (size) that would keep the feature from being too far away from the boundary.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

 

[axym]

JP,

I was thinking of just one tolerance.

The "other place" I'm thinking of is the complement of the tolerance zone. The remainder of space, if you will, that the tolerance zone doesn't take up. There doesn't seem to be an existing term for it.

Evan Janeshewski

Axymetrix Quality Engineering Inc.

http://www.axymetrix.ca

 

[pmarc]

Well, "Position tolerance referenced at MMC for a hole" defines two boundaries, that is Virtual Condition Boundary and Resultant Condition Boundary. Surface of the hole has to fall in between them. So technically that means "the other place" is not the complement of VC - it is VC Boundary plus everything that is outside of RC Boundary.

 

[axym]

pmarc,

Resultant Condition Boundary? This was supposed to be a fun thread. ;^)

I'm not sure about your interpretation of the RC boundary. I don't see the RC boundary as part of the Position tolerance requirement - it's just something that can be calculated. I'll go out on a limb here and say that the feature can violate the RC boundary and still pass the Position tolerance (it would fail the Size tolerance).

Evan Janeshewski

Axymetrix Quality Engineering Inc.

http://www.axymetrix.ca

 

[pmarc]

Sorry Evan for not keeping it funny.
I will refrain from further comments about Resultant Condition, I promise.

 

[fcsuper]

"Keep out zone", aka, the rest of the universe (as stated above). If you are working within the confines of a particular tool, "Keep out zone" might work to describe the area within the tool but outside the tolerance zone.

Matt Lorono, CSWP
Product Definition Specialist, DS SolidWorks Corp
Personal sites:
Lorono's SolidWorks Resources & SolidWorks Legion

 

[axym]

pmarc,

Thanks. We can debate the Resultant Condition thing in another thread if you like. I haven't agreed with you yet ;^).

Evan Janeshewski

Axymetrix Quality Engineering Inc.

http://www.axymetrix.ca

 

[TheTick]

Perhaps the "Forbidden Zone"? Dr. Zaius would approve.

 

[axym]

TheTick,

Yes, that's it! I thought of that myself, but I was waiting for someone else to suggest it so I wouldn't be the only one ;^).

Evan Janeshewski

Axymetrix Quality Engineering Inc.

http://www.axymetrix.ca

 

[TheTick]