In article , GTO69RA4 says...

I happen to have just finished restoring a vintage Rockwell drill press (pics
if anyone wants to see it). It's the usual 4-speed type, but that's not enough
for me. What I'm looking for are photos or descriptions of center
pulleys/jackshafts that fitt around/near the column. Specifically the center
type.

I know lots of folks here have either made them or have DPs with aftermarket
versions from years gone by. Just looking for some design ideas for when I make
mine.

Ths south bend type uses a casting that clamps to the
round column, with a vertical shaft that holds the
c/shaft pulleys.

The walker turner type has a round boss on the head
casting itself, that supports a fore/aft moving
coarse screw - and the screw has a right angle
bracket that supports the pulleys.

One poster here had the great idea to simply mount an additional
motor on the back of the first one, and to use the normal,
high speed motor as the countershaft. The second motor would
drive the first one (off of course) thru a first step of
reduction.

Really the all-time best way is to put a small three phase
motor in, and drive that with a VFD. Works great.

Jim

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