17 replies to this topic

[Jay Kramer @ Precision Programming]

Quick question. What does the symbol between both numbers mean?

I am drawing a blank. anyone

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[Neurosis]

Sorry, missed the "between the numbers" part of that..


I have a geometric tolerancing book that says that is an "Unequally disposed symbol".

Ive never seen that on a print in our shop. It looks like it means that you have a different tolerance above and below the surface.  That is just an assumption.  

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[Jay Kramer @ Precision Programming]

Ya the "U" with the circle around it..

[LancoUSA]

Could that be in Unrestrained state?

[LancoUSA]

A new symbol, circle U, was added to profile tolerance. In the past, a design engineer wanting to specify an unequal profile tolerance on the drawing would draw a chain line in the applicable area. Two arrows were shown to displace the tolerance zone. In the new standard, the circle U symbol follows the toleranced value in the profile feature-control frame. This announces that an unequal tolerance is in effect.

[BenK]

A circled U is for "unequal tolerance zone"

[Jay Kramer @ Precision Programming]

LancoUSA thanks this ex-planes why I can not find it my older books.
Thank you to BenK

[Manuel0822]

Neurosis, on 09 May 2012 - 09:06 AM, said:

Sorry, missed the "between the numbers" part of that..I have a geometric tolerancing book that says that is an "Unequally disposed symbol". Ive never seen that on a print in our shop. It looks like it means that you have a different tolerance above and below the surface.  That is just an assumption.  

Thanks to Neurosis. Never seen that symbol either but that pic was pretty clear on it's explanation. May I ask what book you're using?

Thanks.

[Jay Kramer @ Precision Programming]

The books I had on hand are Dimensioning and Tolerancing we used to use for teaching and another one called Blueprint reading for the Machine trades another we used at the school for teaching.

[Ron Branch @ Master3DGage]

Well this is an Unequally Disposed Symbol.

We handle this very nicely with Verisurf. We give people the ability to use this geometric dimension in checking their parts.

Here is a link to a PDF we did as a tech tip.Linky:

Here is a link to a site we recommend for these types of question as well. Linky:

[K2csq7]

Bookmarked that one! Thanks for sharing Ron!

[Neurosis]

Manuel0822, on 09 May 2012 - 09:30 AM, said:

Thanks to Neurosis. Never seen that symbol either but that pic was pretty clear on it's explanation. May I ask what book you're using?

Thanks.

Geometric Dimensioning and Tolerancing, 8th Edition
By: David A. Madsen and David P. Madsen

[Jay Kramer @ Precision Programming]

Ron Branch @ Master3DGage, on 09 May 2012 - 10:15 AM, said:

Well this is an Unequally Disposed Symbol.

We handle this very nicely with Verisurf. We give people the ability to use this geometric dimension in checking their parts.

Here is a link to a PDF we did as a tech tip.Linky:

Here is a link to a site we recommend for these types of question as well. Linky:

Thanks Ron this is for my customer that is a verisurf customer so I will for this to him.

[newbeeee]

Thanks for the link Ron, and to the explanations from everyone else.
In Ron's link, the right hand view is very explanatory (ASME 14.5). Do I asume this superceeds the left hand view (ASME 14.41)?
In a million years I would never have guessed what the U meant, without a drawing part view (as per ASME 14.5).

[Ron Branch @ Master3DGage]

ASME 14.41 is a complement to 14.5 not a replacement so you have to be very careful how you look and use the information.

[Matthew Hajicek™ -Midland Tech]

So it means the CAD jockey was too lazy to model it at nominal.

[newbeeee]

Matthew Hajicek - Midland Tech, on 09 May 2012 - 01:47 PM, said:

So it means the CAD jockey was too lazy to model it at nominal.

Well said.

[Ron Branch @ Master3DGage]

Everyone here is another link to this: Link:

Here is another one: Different but good.