Do a quick search for reduced shank drills at the top of the page.
http://www.mscdirect.com/

Glenn Cramond wrote:

"Marty" wrote in message ...
I have to drill a number of flat bottom holes, 7/8" diameter and 1/10"
(.1") deep in some 2/10" (.2") thick aluminum. Is there a source for
flat bottom drill bits of this size that will fit in the 1/2" drill
chuck that's on my drill press? If there are no bits of this size with
a turned down 1/2" shank, can an adapter be purchased to go from the
7/8" bit to the 1/2" chuck? Thanks for any help. Marty

Hi Marty,

Easy one if you can sharpen a drill by hand. It's called Zero Angle
sharpening. I'll put the instructions and a couple of drawings on
www.thepiers.net within the next couple of days.

With Zero angle sharpening I,ve drilled hundreds of 1/2" holes in 26
gauge material, no burrs. Your only problem may be getting the 7/8"
drill with a turned down shank check out
http://www.precisiontwistdrill.com/t...p/techhelp.asp.

Glenn