What is the internal radius of a counterbore?
What is the internal radius of a counterbore?
(OP)
I've recently been asked to justify why we do not call out the internal radius at the bottom of a counterbore. Generally, we call out the thru hole diameter, the diameter of the counterbore and the depth of the counterbore with no mention of the radius allowed. Is there a standard for this? I've searched and can not find one. I have never seen a radius callout with a counterbore, but I think it is a fair question.
Thanks for any help!
Thanks for any help!





RE: What is the internal radius of a counterbore?
Chris
SolidWorks/PDMWorks 08 2.0
AutoCAD 06
ctopher's home (updated 10-07-07)
ctopher's blog
RE: What is the internal radius of a counterbore?
As the corner on the c'bore would otherwise be a sharp edge I'd say this applies. However, I doubt most tolerance analysis we do take this into account.
I thought I'd seen a suggested or typical value somewhere, may have been in Machineries.
KENAT, probably the least qualified checker you'll ever meet...
RE: What is the internal radius of a counterbore?
RE: What is the internal radius of a counterbore?
RE: What is the internal radius of a counterbore?
Why do you have to justify not doing it? Shouldn't they justify why it should be done if they are the ones that want it implemented?
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RE: What is the internal radius of a counterbore?
Yes, I am referring to where the wall of the CB diameter meets the floor of the CB. I've never seen a radius specified for this, but it sounds like it is needed. I need to justify it because someone noticed it isn't dimensioned and therefore the drawing is incomplete unless I can argue otherwise.
RE: What is the internal radius of a counterbore?
Chris
SolidWorks/PDMWorks 08 2.0
AutoCAD 06
ctopher's home (updated 10-07-07)
ctopher's blog
RE: What is the internal radius of a counterbore?
RE: What is the internal radius of a counterbore?
Chris
SolidWorks/PDMWorks 08 2.0
AutoCAD 06
ctopher's home (updated 10-07-07)
ctopher's blog
RE: What is the internal radius of a counterbore?
RE: What is the internal radius of a counterbore?
RE: What is the internal radius of a counterbore?
However, I do not find this necessary and I have always included a note like the one KENAT gave or perhaps use this "Unless otherwise specified, all tooling radii to be MAX R___."
One way or another however, I do specify or cover it.