Perpendicularity of B Datum Hole to A Datum

Hello everyone,

I am looking for some guidance on the best way to check perpendicularity of a B datum hole back to A datum. The material is 1.6mm thick and the only thing I can think of would be to measure the B datum at 2 or 3 different depths then construct a cylinder. Am I wrong in thinking this callout is a little silly? I'm grateful for any advice you guys can throw my way.

Thanks

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Matthew D. Hoedeman over 1 year ago

if this is sheet metal, and a pierced hole, it is a 'foolish' callout. What it boils down to is that they want the hole pierced perp to A. I see this a lot, and yes, all-but impossible to measure a cylinder in that pierced hole.
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Matthew D. Hoedeman over 1 year ago

if this is sheet metal, and a pierced hole, it is a 'foolish' callout. What it boils down to is that they want the hole pierced perp to A. I see this a lot, and yes, all-but impossible to measure a cylinder in that pierced hole.
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