The Sherline Miniature Machinist's Newsletter
Customer Project of the Month
A Carriage Reverse for the 3001 Power Feed/William Geissinger
The P/N 3001 power feed is not used in the usual way 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 not a big 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 instead of the handwheel, William Geissinger has come up with a way to install a reverse gear setup. He used two 20-tooth gears from Sherline's P/N 3100 thread cutting attachment and some simple parts he made himself.
By powering the countershaft on the left, the carriage is driven in the reverse direction. The main shaft on the right is extended with a stub shaft to drive it in the standard direction. The power feed motor unit is not fastened down to the bench or base and can be moved to either shaft depending on the direction desired. A store-purchased 3/8" collar with set screw fits on either end of the counter shaft to hold the second gear in place and locate the shaft. (Click on photo to view a larger image.)
Here is what Mr. Geissinger has to say about the project:
ìUsing 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.
The counter shaft turns in the new bearing block and contains two roll pins, one for the second gear and one for the gear motor coupling. The counter shaft has two collars to secure the gear to the shaft. The bearing block has two major holes in it from the sideóone to clamp on the leadscrew support and one for the counter shaft. There are also holes from the top for the clamp screw as well as an oil hole to keep the counter shaft lubricated.î
ï The 3/8" collar with set screw is a standard item that can be purchased at most hardware stores.
ï 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. They just need to engage the slots in the gears and the power feed drive shaft.
You can see this and 68 other handy tips on the Sherline web site at www.sherline.com/pages/tips.htm.
Mounting a Tailstock Chuck/Karl Rohlin
Sherlineís shop foreman Karl Rohlin has some advice for those who find that their tailstock chuck arbor wonít seat properly and tends to spin in the tailstock spindle during drilling operations. He notes:
If the Morse #0 taper on the chuck arbor brakes free and spins it is usually one of several reasons:
1. There might be chips on or in the taper, keeping it from fully seating. Check both male and female tapers and clean them before installing the chuck.
2. The chuck has spun in the spindle previously and scored one or both tapers. This will lead to a bad taper fit or reduced taper fit area, compounding the problem in the future. This may require replacement of the arbor, spindle or both.
3. Use of a drill bit that is a larger diameter than the Morse taper. This tends to happen more with the larger 3/8" drill chuck and means the drill bit is exerting more torque than the grip of the taper surfaces can withstand.
I would recommend that our customers use the chuck key for grip to help turn the chuck in order to seat the tapers fully when they put the chuck into the tailstock. Rotate it as if you were screwing the taper into place. This should lock the tapers much better than just pushing or tapping the chuck into the spindle.
Using a chuck key for leverage to twist and better seat the tailstock chuck in the taper.
REMOVING A CHUCKóThe proper way to remove the chuck from the tailstock is to turn the tailstock spindle handwheel counter-clockwise until the arbor bottoms out and releases from the taper.
The P/N 7505 Parallels are back and better than ever!
The P/N 7505 parallel set is perfectly sized for working with miniature machine tools.
P/N 7505 Parallel Set ($50.00)óLast year the company that imported the parallel sets we offered was no longer able to supply them. For a while we took them out of our tool lineup. However, demand for high quality parallels sized right for our small tools remained high, so we decided to make them ourselves. We cut hardened 1/16" steel sheet stock with our waterjet cutter and then grind it to exact height in house. They are then sent out for a black oxide coating to keep them from rusting. Heights are 1/4", 3/8", 1/2", 5/8" and 3/4". Length of each is 2.5". Like our machine tools, the parallels are now made by us so that we can control quality as well as assure a constant supply. The price is a little higher, but you are getting a better product.
Did you know?
ï Sherlineís Industrial Products Division site has begun the process of adding 3D .IGS format drawings of the most popular components. This will make it easier for designers to spec these components in their tooling designs. We have added 14 drawings so far and will continue to add links to them as our draftsman, John Costello creates them in SolidEdge.
ï New on the Industrial Products site at www.sherlineIPD.com are 5C quick-change 3-jaw and 4-jaw chucks. This is the quickest way to switch from a 5C collet setup to a chuck on your full-size machine tools that take 5C collets. These are a supply from years past we found in storage in a recent inventory. They were made years ago before the big tool suppliers ripped off our idea and started making them overseas. We still have a number of these high quality chucks left in stock and they are now priced lower than even the sale price at the big catalog houses. See the 5C page for details.
†5C quick-change 3-jaw chuck
ï We often wonder what
applications are found for the many P/N 3606, 3607 (10,000 RPM) and
3308 (ER-16) headstock/motor/speed control units we sell. Last month one of the
purchasers, Paul Capdeon of Tensas Machine and Mfg. in
The 4.5" x 10' steel cotton gin saw mandrel being cut using a Sherline spindle motor.
Upcoming Model Engineering Shows
ï Cabin Fever Expo,
ï North American Model Engineering Society Expo (NAMES),
Send us your show details and we will post them hereÖ
Joe Martin Craftsmanship Foundation News
The ìPanther Pupî engine was built by Steve Myers and is beautifully displayed with spare parts in a drawer in the wood base.
óRetired aerospace engineer Ron Remsberg has contributed two new matchstick sculpturesóa Victorian house and a vintage-styled automobile.
óJoe Martin brought in a number of the products he has created over the years to give a prospective of his own career as a craftsman. Included are propellers, joysticks, servo connectors and cases, landing gear, a hobby knife and a number of plastic parts for which he made the molds. There is also a kit plane he designed for Kraft Systems that was quick and inexpensive to built and easy to fly.
óJohn Ackerman donated an eighth
fire truck model built by Tom Showers. This one
is a 1/32 scale 1965 Morita-Isuzu hose tender. See www.craftsmanshipmuseum.com/other.htm
for this and many other displays in the
ï Club and Group VisitsóOn October 27th, the Vincent Motorcycle Club stopped by for
a visit. We opened specially on Sunday the 28th for a large group of
hotrods on a tour that was headed for the SEMA show in
The Joe Martin Foundationís Miniature Engineering Craftsmanship Museum is open every non-holiday Monday, Tuesday, Friday and Saturday from to Admission is free. We offer it as a haven for craftsman concerned that their best work might not be properly appreciated or professionally maintained after they can no longer care for it. Here it will be treated with the respect it deserves and displayed for others to appreciate. If you donate while still alive you can benefit from a tax deduction for the projectís value plus gain the satisfaction of seeing you work displayed in a fine museum.