Concentricity Callout. What does it mean?
Concentricity Callout. What does it mean?
(OP)
Hi All,
I see this callout on a part I'm checking. I've not seen the way it called out for concentricity like this. Does it mean center of 3 .250"Holes (Boldcircle) concentric to |B|?
(Normally, I see concentricity of 2 circles at the same locations.)
Thanks!
I see this callout on a part I'm checking. I've not seen the way it called out for concentricity like this. Does it mean center of 3 .250"Holes (Boldcircle) concentric to |B|?
(Normally, I see concentricity of 2 circles at the same locations.)
Thanks!





RE: Concentricity Callout. What does it mean?
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Concentricity Callout. What does it mean?
If it means the boldcircle (of 3x .250" holes) concentric to |B| then I just added a yellow boldcircle to the sketch.
But I still don't understand why concentricity while True Position is already called out? It may tight up the tolerances and could add composite tolerance for those 3 holes....
Any idea to this callout?
RE: Concentricity Callout. What does it mean?
Are the holes centre-bored? I am trying to make sense of datum C. It is logical that a centre-bore should be concentric with the through hole, although a location tolerance would work just as well.
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JHG
RE: Concentricity Callout. What does it mean?
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Concentricity Callout. What does it mean?
CheckerHater: Yes, you're correct. The concern is the 3 holes, .250" to |B|.
RE: Concentricity Callout. What does it mean?
Your pitch circle is imaginary. You cannot apply a tolerance to it, particularly concentricity. You can apply positional tolerances to the individual holes.
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JHG
RE: Concentricity Callout. What does it mean?
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
SSG, U.S. Army
Taji, Iraq OIF II
RE: Concentricity Callout. What does it mean?
I will find out what the mating part will do to this part.
RE: Concentricity Callout. What does it mean?
John Acosta, GDTP Senior Level
Manufacturing Engineering Tech
SSG, U.S. Army
Taji, Iraq OIF II
RE: Concentricity Callout. What does it mean?
To my understanding, the design would go with fig 7-26 (on p122 in the 2009).
The main thing is they want each .250"hole concentric to the cbore, |C|.
Anyway, the callout is NOT right.
Thanks for all of your guys' help.
Have a great day!
RE: Concentricity Callout. What does it mean?
You are right that fig. 7-26 is most likely what they need.
"Know the rules well, so you can break them effectively."
-Dalai Lama XIV