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Angularity - When angularity is called out should it be to a basic dimension

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Related Topic Tags
angularity, basic dimension, gd&t (geometric dimensioning & tolerancing), prints (drawings or blueprints), print (drawing) callouts, drawing (also see prints)
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  #1  
Old 16th July 2010, 12:28 PM
jfbock

 
 
Posts: 20
Question Angularity - When angularity is called out should it be to a basic dimension

Simple question I am having a hard time finding a concrete answer on.

When angularity is called out, should the angle it refers to always be a basic dimension? Wouldn't the angularity callout BE the tolerance for the angle.

I have a customer print that has angularity only as a callout (no form tolerance) and a regular (non-basic) angle callout. My understanding is this is not correct.

Appreciate any help.

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  #2  
Old 16th July 2010, 01:03 PM
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True Position

 
 
Posts: 663
Re: Angularity

You are right that this is not correct. Either you are measuring the angle(traditional result in °) or the form error from the basic angle. (GD&T angularity)
Thanks to True Position for your informative Post and/or Attachment!
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  #3  
Old 16th July 2010, 03:56 PM
David DeLong's Avatar
David DeLong

 
 
Posts: 458
Re: Angularity

Quote:
In Reply to Parent Post by jfbock View Post

Simple question I am having a hard time finding a concrete answer on.

When angularity is called out, should the angle it refers to always be a basic dimension? Wouldn't the angularity callout BE the tolerance for the angle.

I have a customer print that has angularity only as a callout (no form tolerance) and a regular (non-basic) angle callout. My understanding is this is not correct.

Appreciate any help.
Using both ASME Y14.5M-94 and now th3 2009 edition, the angle must be shown in a basic dimension. The tolerance in the feature control frame is tolerance for this angle. If the drawing reflects the angle without being a basic dimension, then the drawing is incorrect.

By the way, angles on surfaces in GD&T also include flatness while angles in holes include straightness.
Thank You to David DeLong for your informative Post and/or Attachment!
  #4  
Old 16th July 2010, 08:19 PM
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Jim Wynne

 
 
Posts: 14,077
Re: Angularity - When angularity is called out should it be to a basic dimension

Quote:
In Reply to Parent Post by jfbock View Post

Simple question I am having a hard time finding a concrete answer on.

When angularity is called out, should the angle it refers to always be a basic dimension? Wouldn't the angularity callout BE the tolerance for the angle.

I have a customer print that has angularity only as a callout (no form tolerance) and a regular (non-basic) angle callout. My understanding is this is not correct.

Appreciate any help.
TP and David have answered the "basic" question, but I'll add that whenever you encounter ambiguous specifications it's best to ask the customer what the intent is. If there's no reference to any GD&T standard on the drawing, it means that the designer can use the symbols to mean whatever she wants them to. Even when the standard is referenced, designers will often demonstrate their failure to understand it.
  #5  
Old 16th July 2010, 08:39 PM
Stijloor's Avatar
Stijloor

 
 
Posts: 14,654
Re: Angularity - When angularity is called out should it be to a basic dimension

Quote:
In Reply to Parent Post by Jim Wynne View Post

TP and David have answered the "basic" question, but I'll add that whenever you encounter ambiguous specifications it's best to ask the customer what the intent is. If there's no reference to any GD&T standard on the drawing, it means that the designer can use the symbols to mean whatever she wants them to. Even when the standard is referenced, designers will often demonstrate their failure to understand it.
How true this is! I often see drawings with mixed symbols from 1982 and 1994 GD&T standards.. No standard reference in the title block, so it becomes pure guesswork...

Stijloor.
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