Our suppliers manufacture composite pannels that have 100° countersunk holes for fastener installation. We ask our suppliers to make shure that the countersinks are concentric with their holes within .002". Most of them drill and countersink in two different operations. How can they measure the concentricity of the countersink with their own pre-drilled holes?
I have seen the very instructive concentricity page from David Delong (see the 27th April 2011, 12:00 PM Comment in the Thread: Query on concentricity inspection).
I have seen several threads on this forum about concentricity...
But still, I don't get how to verify that.
Anybody has any clue?