My new 1943 South Bend 9c lathe

Ryan313

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The unit belonged to a gentleman who worked for a company with many military contracts, and he took this home one day when they replaced it. The man passed away and his nephew is cleaning out the house. The nephew has no interest in it, and listed it on letgo. Anyway, I picked this up a couple weeks ago, and haven’t had much time to mess with it yet. I have found an hour here and there, but mostly just moving things back in forth in fascination...pretty much the only noteworthy thing I did was take the chuck apart to clean and free it up. The other reason I haven’t messed with it too much, is because I have been waiting for a manual on it, which came in the other day. I skimmed through it this morning over coffee and feel like I have a decent grasp on it. This week I am going to get one of those wooden top toolbox workbenches to mount it on, and clear a spot for it in my small garage. The machine came with lots of tooling, but about half of what I got is for a Morse #3 or 4, this has a #2. There were a couple lantern style tool posts, but nothing that would make a complete post. I ordered a quick change that should arrive in a day or two.

According to the manual I got, the large gear on the countershaft (I think that’s what it was called) is called a flywheel. The flywheel has one flat spot, not a double pulley like I can find on almost all pictures I see online. The motor was missing, but there was homemade contraption that the seller threw in, because that may have been the motor for the lathe. The motor is 1/4HP, and I the shaft is about 3/8-1/2 off memory. I found a motor pulley on eBay that has a 3/4 shaft, and I think I may have a pulley with that size hole. There were a couple pulley on the table with the lathe that I scooped up, since anything I didn’t take was getting thrown away. Maybe the motor that I took was not the correct motor, although it does bolt right on; I would imagine that these old motors have a somewhat universal bolt pattern? Anyway, here are some pictures, and I appreciate any advice or knowledge!
 

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Ok I'll start with this. A 1/4 hp. motor is kinda small for that lathe. Look at the motor tag and see what the frame # is. It will probably be something like "Fr 56" seeing as it's a rigid mount. Any motor with the same frame # will interchange. If it were me 1/2 hp. or better 3/4 hp. would be prefered to start with.
Looks like you came up with a good machine.
 
I did some research, I guess these came with a 1/4hp or 1/2hp from what I am finding. I suppose I will try out the 1/4 since I have it, and if it’s not enough I will get another.

As for the pulley, the one in the crate I found has a 1” shaft and 4” diameter. The larger flywheel is 7/8” shaft and 10” diameter. Given the 4” pulley is the right size, that gives it a 1:2.5 ratio. If I replace the pulleys with a 2” and a 5” I will have the same ratio, and I can mount the lathe a few inches closer to the wall since the toolbox I am looking at getting is cutting it close anyway. Do you think I will have any issues with smaller pulleys? Since it is the same ratio I wouldn’t think so, but I would like another opinion,
 
I did some research, I guess these came with a 1/4hp or 1/2hp from what I am finding. I suppose I will try out the 1/4 since I have it, and if it’s not enough I will get another.

As for the pulley, the one in the crate I found has a 1” shaft and 4” diameter. The larger flywheel is 7/8” shaft and 10” diameter. Given the 4” pulley is the right size, that gives it a 1:2.5 ratio. If I replace the pulleys with a 2” and a 5” I will have the same ratio, and I can mount the lathe a few inches closer to the wall since the toolbox I am looking at getting is cutting it close anyway. Do you think I will have any issues with smaller pulleys? Since it is the same ratio I wouldn’t think so, but I would like another opinion,
Many people who "upgraded" the old Atlas laths with 1/2 and larger motors regretted it when they had a crash and the extra power destroyed more of the machine than the 1/3 horse would have. Accidents happen and more power multiples the damage. Don
 
If your going to upgrade the motor look real hard at a tread mill motor. Usually around2 -2.5 hp which is plenty big but run it belt drive and not to tight a belt and they work great. Will have infinitely variable speed control which can be adjust to the FPM (Feet Per Min of the item being turnde) rather than the RPM. Got mine at a Salvation Army and it really works nice.

Get a small set of the replaceable carbide tipped tools. Usually come 5 to a set for the 3/8" tool. 1/2" are a bit higher. These tools will cut so much better there is no comparison and you dna't have to mess around trying to keep the steel tools sharp and ground right. Just a few things I have learned since I got my mini lathe.
 
If your going to upgrade the motor look real hard at a tread mill motor. Usually around2 -2.5 hp which is plenty big but run it belt drive and not to tight a belt and they work great. Will have infinitely variable speed control which can be adjust to the FPM (Feet Per Min of the item being turnde) rather than the RPM. Got mine at a Salvation Army and it really works nice.

Get a small set of the replaceable carbide tipped tools. Usually come 5 to a set for the 3/8" tool. 1/2" are a bit higher. These tools will cut so much better there is no comparison and you dna't have to mess around trying to keep the steel tools sharp and ground right. Just a few things I have learned since I got my mini lathe.

The treadmill motor is a good tip! I’d like to see some pictures of yours.

I got a lower end set of bits. They don’t replaceable tips though, I figured I would get a variety set to see what I use and learn how to use it, so I know what tools to get with replaceable tips.
 
Secondtry is correct about a larger motor causing more damage. This is one very good reason not to walk away from a running machine. You can also limit any chance of damage by installing a fused outlet for your lathe. Use quick blow fuses just big enough to operate the machine under normal loads. This will take a little experimenting but should be worth it in the long run. Eventually you will run the carriage or tool holder into the chuck. Please don't wear long hair of loose clothing when operating your lathe.
Holy cats that's a big belt for a 1/4 hp. motor.
 
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Also with a tread mill motor you eliminate that back hunk of iron with the step pulley as the variable speed will replace all of that. Mine turns a 3" chuck from around 250 rpm up to around 1600. I bought a set of those cheep bits also and got them tucked way back some place as they will never be used except for parts for something.
 
I have to stay with the original belt system on my SB 10 x 42 as it uses a flat belt. The original leather belt gave it up, so I measured for a serpentine belt and took the headstock off to install it. I like the flat belt as if you snag hard it will slip off the pulley.
 
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to use a slate base 1.5" =always true level won't warp or twist and rigid, my zyto model B912 lathe is on slate , but mental heavy lol
 
I got the toolbox today! It’s a husky box, so not the greatest but I think it will serve me well. At first I planned to build a wooden bench/ cabinet, but I decided that since the lathe will likely last me near forever, I would get a decent box to go with it. The wood is not sealed, do you guys think I should seal it? With the oil coming from the lathe I figured I should but I’m not sure what to use. Any recommendations?

I got the area cleared out, and I didn’t have as many things in that corner as I thought I did. I will still have to spend a few hours reorganizing though.

I also can’t decide if I want to refurb the lathe before I get it mounted and operational, or do it later this summer. I would like to get it operation and get everything organized again before I tear it apart; although we all know that most things take longer to get around to than we plan.

The forks I just made for the terramite worked great to move the box and hold it up for easy mounting of the wheels.
 

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I would not put the lathe where the tool box is setting now. You won't have room to pass longer pieces through the spindle bore.
As far as sealing the wood goes you can use polyurethane as I think it's impervious to most oils.
 
If you have your tool box close to next to your lathe you will have metal chips in the tool box, and in your fingers when you grab a wrench, etc. from the tool box. I think the Husky Box is made by the same company that build them for a lot of other stores including HF. Most of those are made by Waterloo Tool company. Good boxes. Have had mine in use almost daily for about 10 years now.
 
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