On Mon, 2 Mar 2009 08:34:42 -0500, "Joe AutoDrill"
wrote:

How did you do it? Internal gears? stacked? Magic? How are the
drills retained? 00 Morse taper?

Hardened, helical internal gears and ER-style spindles. ER16M
-------------
Sounds like a quality unit.

Without knowing the design parameters such as the helix and
pressure angle it is hard to estimate, but helical gears generate
axial as well as radial thrust in operation, which increases as
the load increases.

Is the helix angle of your gears such that it bucks or reinforces
the thrust required for the drill to penetrate?

Also second another posters idea that it may be possible to put a
thrust bearing on top of the drive gear to absorb some of the
load. Impregnated bronze [teflon?] may be adequate.


Unka' George [George McDuffee]
-------------------------------------------
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?

Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).