G'day Ellis
Drilling from the tail stock is OK but the drill or chuck is held by a
taper. If the drill self feeds it breaker its grip with the taper and
slips. An exercise in futility. You have to keep cutting pressure om
the drill and the drill takes over so you can't restrict the feed rate.
A reamer is the way to go. Note that machine reamers have straight
flutes whilst hand reamers have spiral flutes.
One good turn deserves another.
Regards,
Ian
--- In 7x12minilathe@..., "Ellis Cory" <ellis103@...> wrote:
Roy wrote.....The practical problem is controlling the feed of a
large drill enlarging a hole; they tend to self feed at their spiral
rate..........
I believe this is only true with lever operated machines, such as
drill presses. Using the screw operated tailstock and only opening up
by 1/64" at a time should be very little problem. If necessary, the
lips could be 'backed' off in the same fashion as brass drills. Of
course, the quill travel is limited, so it's a case of drilling a bit,
move the tailstock a bit.
HTH
Ellis
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