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Home > Forums > Engineering Methods > Engineering Methods > Drafting Standards, GD&T & Tolerance Analysis Forum

GD&T of a counterbored slot

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CroninD (Mechanical)

30 Jul 12 6:36

Hi guys,

Relatively new to GD&T. I have a base plate in an assembly with two counterbored slots in it. I know how to geometrically tolerance a normal UN-counterbored slot; i.e;
Link

How do I go about it if the slot is counterbored from the underside to give clearance for a socket head cap screw? Is it the same as dimensioning a counterbored hole minus the diameter symbol? Or should i tolerance the top and counterbored sides seperately?

Any help is much appreciated.

D.

KENAT (Mechanical)

30 Jul 12 15:39

I'd probably tolerance/dimension as two 'coincident' slots where one of them has a depth associated. I'd probably dimension the depth in a section view just to make clear.

If using position & envelope principle to locate the slots I think this should work OK and minimize chance of confusion.

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CheckerRon (Mechanical)

30 Jul 12 15:42

I've done this before and there is a couple ways. You can dimension the slot and the counterbore slot to the same datums each having it's own FCF and maybe a relaxed tolerance on the counterbore, or you can positional tolerance the slot a per the standard and give it a datum, say D. then tolerance the counterbore slots to datum D, "4X INDIVIDUALLY" (or however many there are).

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