TIP 69 — A Carriage Reverse for the 3001 Power Feed/William

TIP 69 — A Carriage Reverse for the 3001 Power Feed/William
TIP 69 — A Carriage Reverse for the 3001 Power Feed/William Geissinger
The P/N 3001/3011 power feed is not used in the
usual sense you think of a power feed on a big
production lathe; that is, to save the labor of turning
the leadscrew handwheel when doing a large job. In
most cases on a lathe as small as a Sherline physical
labor is simply not a factor. Instead, this power feed
is intended to be used to put a perfectly consistent
finish on the last pass of a part on the lathe. It runs at
a single speed of .9"/min and only in one direction.
For those who want to use the power feed to return
the carriage to its original position, William
Geissinger has come up with a way to install a
reverse gear setup. He uses two 20-tooth gears from
Sherline’s thread cutting attachment and some
simple parts he made himself. His description
follows.
By powering the countershaft on the left the carriage is driven
in the reverse direction. The main shaft on the right is extended
to drive it in the standard direction. The power feed motor unit
is not fastened down and can be moved to either shaft end
depending on the direction desired. A store-purchased 3/8"
collar with set screw fits on either end of the countershaft to
hold the second gear in place and locate the shaft.
Plan
“Using the two 20-tooth, 24P gears (P/N 31200)
from the P/N 3100 threading kit and adding a
parallel countershaft to accommodate a gear,
reversal is accomplished. As you can see from the
photo, the countershaft is equipped with two roll
pins for the gear motor coupling and to engage the
gear. The gear motor simply sits on the same base as
the lathe and is not fastened down. To reverse the
carriage you just move it from one shaft to the other.
To fasten the gear to the fixed shaft (P/N 15430) a
stub shaft was made to thread into the 10-32 hole in
the end of the Sherline fixed shaft. Use a washer
between the two shafts and tighten fairly tight, as
motor rotation tends to want to unscrew the stub
shaft. This stub shaft also contains a roll pin to
engage the keyway in the gear motor coupling just
like the one on the standard fixed shaft.
Continued on Page 2
SHERLINE PRODUCTS INC. • 3235 Executive Ridge • Vista • California 92081-8527 • FAX: (760) 727-7857
Toll Free Order Line: (800) 541-0735 • International/Local/Tech. Assistance: (760) 727-5857 • Internet: www.sherline.com
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The countershaft turns in the new bearing block and
contains two roll pins, one for the second gear and
one for the gear motor coupling. The countershaft
has two collars to secure the gear to the shaft. The
bearing block has two major holes in it—one to
clamp on the leadscrew support and one for the
counter shaft. There are also holes for the clamp
screw as well as an oil hole to keep the countershaft
lubricated.”
NOTES:
•
The 3/8" collar with set screw is a standard item
that can be purchased an most hardware stores.
•
Holes for the roll pins are to be sized for the
particular roll pin you use. Measure the one used
on the fixed shaft and match as closely as
possible.
—William Geissinger
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