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Datum call out on a hole

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FrancoisY

Mechanical
Joined
Nov 10, 2023
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34
Location
US
Hello all,

I am fresh to GD&T and was wondering what a datum on a hole represents and what does it describe back to me. Image below
Datumn_Hole_mckklg.png
 
Although it's touching the wall of the hole, the "datum" is the imaginary, perfect axis (center) of that hole.
And, depending on how that datum C is referenced in a tolerance frame somewhere, the axis may have to be oriented to other datums such as A or B.
 
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