Drawing tolerance

• Jun 9, 2023

• #2

pmarc

Mechanical

Sep 2, 2008

3,168

dogbural,

Typically, #1 is used to control features that are defined with basic dimensions whereas #2 is for non-basic dimensions.

 

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• Jun 9, 2023

• #3

greenimi

Mechanical

Nov 30, 2011

2,259

pmarc,

This is the same as the unsettled argument about this figure. We disccussed it here:

https://www.eng-tips.com/viewthread.cfm?qid=503466

But we haven't reached any conclusions. At least I don't think we did find out any meaningfull way of interpreting this drawing.

When you say Typically what does that mean? Common understanding? Since we all know the UOS is anything but clear.

 

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• Jun 9, 2023

• #4

powerhound

Mechanical

Jun 15, 2005

1,298

From ASME Y14.5-2018

John Acosta, GDTP Senior Level

 

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• Jun 9, 2023

• #5

greenimi

Mechanical

Nov 30, 2011

2,259

So based on powerhound embedded picture, should we understand that the OP drawing is at fault?
Or it is good "as -is" and it is interpretable?

 

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• Jun 9, 2023

• #6

Burunduk

Mechanical

May 2, 2019

2,356

greenimi said:

should we understand that the OP drawing is at fault?

Click to expand...

It is, but from different reasons, not related to that part of the standard which was put in focus by powerhound here (are you guessing what they might be?). It is not invalid per ASME Y14.5.
The OP example doesn't state that untoleranced dimensions are basic. It might be clear from the drawing views (which we can't see) which dimensions are basic and which are toleranced. The Y14.5 rule indicates that the example from the other thread (the one you mentioned) is incorrect, and it was intended to prevent the ambiguity related to it. This rule was also brought up in the other thread.

 

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• Jun 9, 2023

• #7

powerhound

Mechanical

Jun 15, 2005

1,298

Burunduk said:

The OP example doesn't state that untoleranced dimensions are basic.

Click to expand...

Note 4 seems to say that all dimensions are basic, unless otherwise specified. Is that not pretty much the same thing?

John Acosta, GDTP Senior Level

 

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• Jun 9, 2023

• #8

greenimi

Mechanical

Nov 30, 2011

2,259

powerhoud,

I think Burunduk is talking about the OP example where we don't have note 4 or something related with untoleranced dimensions as being basic

 

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• Jun 9, 2023

• #9

Garland23

Mechanical

Dec 4, 2021

105

Greenimi,
But if there is a general profile tolerance, doesn't that imply that profile applies to some basic shapes on the drawing?

 

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• Jun 9, 2023

• #10

Burunduk

Mechanical

May 2, 2019

2,356

powerhound,
There is no note 4 in the OP example.

 

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• Jun 12, 2023

• #11

Wuzhee

Automotive

Jul 12, 2022

275

These drawings are the result of several years of reworking through a dozen departments and engineers across a company. One wants a general tolerance table, the other requires a standard callout, third wants basic dimensions etc. And everyone just slaps their table on the sheet without thinking for a second.

 

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