On Apr 7, 1:21*am, Ignoramus17356 ignoramus17...@NOSPAM.
17356.invalid wrote:
...

I thought I could reduce a shank of that drill bit by simply chucking
it in a lathe and taking off some diameter with a carbide tool. What
are the drawbacks, if any, of doing so?

i

HSS drill bits are easy to turn smaller but then they slip more easily
in the chuck. If you have 5C collets and a hex block or indexer you
could mill three flats to get it into the drill chuck.

21/32" is the tap drill for 3/4-10 so I wouldn't change it enough that
it no longer fits the larger chuck.

jsw