On Apr 13, 8:38 pm, Larry Jaques
wrote:

If you're saying what I think you might be saying, the angle is called
"lip angle". If you set the bit down on its cutting edge, it's the
clearance angle from the cutting edge to the back of the edge, right?

Right... I did some searching and I've now seen it referred to as
"Drill Lip Relief Angle". So 'Relief Angle', 'Lip Angle'... I guess
all the same thing, right? All I know is that all the ones I've tried
with a sharp angle there don't do what I want, and the couple I have
that have the very modest angle do... So that must be the difference.

Dave