"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote:
Rich Grise fired this volley in

Why not just a plain ol' ordinary everyday run-of-the-mill
seen-one-seen-'em-all 60 degree countersink?

He wants to do it in one drilling operation.

I've seen drill "bits" that were designed to drill pilot holes in
wood for wood screws, but they're like a stamped piece of metal
plate, like a spade drill. And I seriously doubt if anyone's
producing them for a #30 hole.

If you have a production run of parts, it might be worthwhile
to have a custom cutter made.

Good Luck!
Rich