For the drills with the oil feed holes parallel to the shank, which run
from one end of the drill to the other, is a different bushing made for
every diameter of drill? Also, is the oil fed under pressure? I was
contemplating settting up something to use oil-fed drills in the tailstock
of my lathe. I'm finding a lot of stuff about the drill bits themselves,
but not much on the equipment needed to run them. TIA.

Many people use special collets for this. They seal with rubber around the
drill.

There is, however, a company that makes a collet chuck that sprays coolant
out from the partially open collet "slits" downeard without usign special
tooling other than the chuck. I'd go that way unless you need the coolant
right at the tip of teh drill for some close-to-the-limit machining and/or
drilling.

Do you need to run at optimum speed or can you slow it down by 25% and
simply use a less elaborate method of cooling the tip and lubricating teh
cut?
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Regards,
Joe Agro, Jr.
http://www.autodrill.com
http://www.multi-drill.com

V8013

My eBay: http://tinyurl.com/3n8gj