5

Shopmaster L-500 Lathe

I recently purchased a Shopmaster L-500 lathe. It has been restored to its original condition, unfortunately it did not include a manual. This particular lathe has a 4-stepped pulley in the headstock and originally had a 4 step pulley on the motor (though the restored motor has only three.)

Researching about pulley drives on lathes, I have heard mention of a Reeve's Drive, but I don't think that this is an actual Reeve's mechanism because there is no facility to push or pull the pulleys to move the belt.

Does anyone with an older vintage lathe have any suggestions on how to properly change the speed of the lathe?

Here's a view of the headstock and the pulleys inside:

Headstock pulleys

And here's a photo at the motor:

Motor pulleys

|improve this question
  • 2
    I feel like I'm missing something here. Can you not just change the belt's location on the pulleys? You might have to loosen the motor to do so. Most lathes have a built-in mechanism to do this, though yours looks more "homebrew." – grfrazee Mar 14 '16 at 16:27
  • @grfrazee that's pretty much exactly what I assume I'd need to do as well but I was hoping that maybe I was missing something. As it stands, if I want to change speeds on this lathe, I need to loosen the motor to get the belt off, change the belt position on the pulleys and then tighten the mount back down. I was hoping there was a less onerous process that I was missing. – Peter Grace Mar 14 '16 at 18:19
  • Unfortunately, grfrazee is correct. This is also how you change speeds on many drill presses. A Reeves drive has a V-belt spanning 2 pulleys that are continuously variable in diameter. Each pulley is made of 2 sheaves (opposing cones) such that pushing the sheaves closer together increases the circumference of the pulley and pulling them apart decreases it. See en.wikipedia.org/wiki/Continuously_variable_transmission – rob♦ Aug 9 '16 at 23:17
  • I have same lathe,cant get the bearing plate off. plate turns in place if knocked with a mallet through the pulley access. any trick to the bearing plate? You can grab a new four stage pulley for about 20 bucks from tractor supply/ good old school hardware store – user2604 Aug 22 '16 at 0:59
4

I have the same lathe. I don't know how the previous owner changed speeds, as it was screwed to the workbench. When I got it home, I built a stand for it. I mounted the motor on a 2x6, which i fastened to the stand with a hinge. On the other side, I cut a slot to fit over a bolt that sticks out of the stand. So, when I need to change the speed, I just loosen the wingnut on the bolt, raise the motor on the hinge, change pulleys, set the motor down and fasten the wingnut. Takes all of 30 seconds to change speeds.

|improve this answer
  • 1
    A picture would be super helpful here. – Matt Aug 9 '16 at 18:22
  • If @PeterGrace unfastened the shelf at the motor end, and put a hinge on the shelf at the far end, and didn't store too much stuff on the shelf, it would work this way - might not even need to bolt it down (weight of shelf and motor might be sufficient to tension the belt.) Pick motor end of shelf up, change belt, let it drop. Add a tiedown/tension bolt if needed. – Ecnerwal Mar 14 '17 at 3:24
3

My PSI lathe was similar (though a bit smaller) and there was a locking mechanism that I had to loosen so the motor would 'raise' a little releasing the tension on the belt, then I could move the belt to what ever set of pulleys' I wanted.

One thing I noticed about yours is that the motor has fewer pulleys' than the head of the lathe. 3 vs. 4. Most I've seen have 1 - 1 in this kind of configuration. So as the head wheel gets smaller the motor wheel increases in diameter.

What I don't know is if this was designed to be a 4 speed (and the new motor doesn't have enough pulleys') or more like an 8 speed where you can use one or 2 pulleys next to each other, but that seems unlikely.

What ever you use to loosen the belt need to make sure when it is tightened it is fairly snug, since that will transfer more power to turn and less likely for the chisel to catch and hold the piece instead of cutting it.

|improve this answer
  • I found a "quick start" manual that appears to be for this lathe at vintagemachinery.org/pubs/detail.aspx?id=5646 (the L-5XX parts lend support here, I'm not sure what other lathes shopmaster made at the time). In the parts list there the motor spindle also has 4 steps. It's possible that the OP's 3-step spindle is not the original part, and that it was 1:1 to begin with. – Jason C Mar 14 '16 at 16:58
  • @JasonC good job! I suspected that was the most likely case. – bowlturner♦ Mar 14 '16 at 17:00
3

I found some sort of "quick start" manual for this lathe here. In the parts list there the motor spindle also has 4 steps. It seems likely that the your 3-step spindle is not the original part, so don't be surprised by the belt not lining up for every position.

In any case, while it's not a full manual, it does say (emphasis mine):

To place belt on head stock pulley remove 3 Allen head set screws on bearing plate and remove shaft from Head Stock.

The bearing plate is:

enter image description here

So I imagine this is the procedure you'd to follow to move the belt as well, although I cannot say for certain what other steps may be involved. In particular it does not mention tensioning the belt so you may have to poke around and look for a release mechanism, if there even is one.

With your current setup you're limited to 3 speeds unless you can slide the motor spindle around a bit. I would not mount the belt at an angle.

I am certain that guide is for the L-500. According to some catalogs from the 50's (and one from 1953, with an awesome first page illustration) the L-500 was their only lathe at the time, so that must be the lathe.

|improve this answer
  • 1
    That catalog is a great find! The original owner seemed interested in the TA-900 on pg. 3. I'm bemused by the CS-5200 on pg 5 - I've never seen a table saw where the table tilts! Also, the SS-700 on pg 15 may finally be the answer to "What's the difference between a jig saw and a saber saw?"! – FreeMan Mar 17 '16 at 13:54
  • 1
    @FreeMan I'm fascinated by the CU-6000 (combination drill press, radial arm saw, belt sander, disc sander) myself. I saw somebody online selling one for only $300 a while back. – Jason C Mar 17 '16 at 14:04
  • 1
    And, if you scroll all the way down to pg 22, you can prove to your wife that more tools are critical to a better life! – FreeMan Mar 17 '16 at 14:13
  • You only have to pull the spindle to put a new (non-link-type) belt on, not to move the installed belt. Look at a ShopSmith if you want to see a tilting table saw that was arguably somewhat more of a commercial success, though I don't consider it a nice tablesaw anyway. This would seem to be a competitor in the same market? – Ecnerwal Mar 14 '17 at 3:27
3

My lathe is similar, though not identical, so this may not apply, but so long as you don't have too much tension on the belt, you shouldn't need tools and you shouldn't need to loosen and shift the motor each time.

(This also works for changing the speeds on a drill press)

The two pulleys are straight opposites of one another - as one gets bigger, the other gets smaller. This means that once the belt is on, regardless of which speed it is at, the tension required will be the same.

So, to shift speed, change belt positions like you'd remove a bike chain - push the belt on one pulley towards the next smaller sized ring, whilst turning (slowly and by hand!) the belt so that the rotation of the pulley pushes the belt off. Once it's slipped off the first ring, there should be pretty much no tension and you can shift the belt to the new position.

To get the belt back on, reverse the process.

|improve this answer
1

I'll weigh in with the radical fringe - normal solutions seem pretty well covered.

In my personal experience, the best thing you can do is to swap the motor for an industrial DC or 3-phase motor and run that motor from a variable speed drive suited to what type of motor it is. These days 3-phase driven by a VFD seems to be most common/cheapest, though if you are willing to pick up craigslist free treadmills and take them apart, you may find a nice DC variable speed system inside it (with, IMPE, somewhat inflated ideas of its horsepower, but still fine for a mid-sized or smaller lathe.)

A that point, the stepped pulley is just a torque/top-speed selector.

It is a world of difference being able to get just the speed you want with the twist of a dial (and without the squealing of a Reeves drive.) Harmonic vibrations are easily avoided by making small speed changes.

Additional note - if there's room (there probably is) the "link or twist" belts are a much nicer way to change belts than pulling the spindle to change the belt. Since they can be twisted apart to change the number of links, you can get any length you like and break the belt to thread it onto the lathe, then re-make it, rather than pulling the spindle.

Whatever drive you use (including the fixed speed one) it's a very good idea to have a shutoff at BOTH ends of the lathe.

|improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.