On Sun, 13 Apr 2008 17:29:31 -0700 (PDT), with neither quill nor
qualm, Dave99 quickly quoth:

I recently discovered how to fix an issue with drilling that I was
having... I wanted to drill at a fairly slow speed in certain
materials and found that one type of bit worked best. Unfortunately,
they don't make that bit in letter sizes, which I need. Through
experimenting, I've realized that the reason why just this one bit
brand/type works so well, is how they designed the angle on the tip.
Not the point angle that is generally spoken of, such as 118 degrees
or 135 degrees... but the angle at which the tops are cut at. I'm not
even sure what you call that part of the bit. But if you look at the
bit from the side and see the main point, which is typically the
standard 118 or 135 degrees... then turn the bit to the other side and
look at the angle that goes along the top of that side... This is the
angle the controls how much bite the blades (if that what's they're
referred to) make into the material. I noticed that, that 'blade'
angle on the bits that work well for me are particularly flat compared
to most other bits... There's very little angle/bite at all. So... My
question is, does anybody know of a sharpener that isn't a fortune,
but can control that angle? Or is it possible to find human-beings
these days that actually know enough about sharpening to understand
that? I would like to sharpen numerous bits to that configuration.

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?
A high angle there would tend to parallel the twist from the back, so
you want a low angle.

You can sharpen them by hand that way. Never having used a drill bit
sharpening machine, I don't know if that angle can be set or not.

You could also give the point angle less than 118 degrees by holding
it to the grinding wheel at a lesser angle, but I think it's the lip
you're talking about.

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