South Bend Lathe Will the Lathe Stop Feeding if It Hits Something

Quote Originally Posted by G-ManBart View Post

I think the short bed 16 was 34" and the next size up was 46" followed by 58". Assuming you're not going to be turning bit truck axles that's a great combination...heavy frame, thicker bed, etc, etc, but a shorter length so it should be stiffer than a longer bed and it won't take up a ton of space.

34" sounds about right. This will just be used for making tools like seal/bushing drivers, custom pins and bushings, etc. I've sent out out a lot of equipment parts for that sort of thing over the years to salvage otherwise junk that could be saved with a bit of ingenuity.

curious as to how close it can maintain. old iron unless it's been babied is usually worn.

Quote Originally Posted by filetobeef View Post

curious as to how close it can maintain. old iron unless it's been babied is usually worn.

If the spindle bearings are reasonably decent it probably isn't going to be an issue for the type of work he's doing and even if it needs some work the parts are generally available.

Other than being grimy it doesn't look bad at all...heck, the left front corner of the compound doesn't even look nibbled on! If I saw that machine for $500 anywhere within about a three hour drive I'd be hooking up the trailer to go get it! Hopefully we get to see pics after it's cleaned up...other than the yellow highlights I suspect it's going to look great.

Quote Originally Posted by 12V71 View Post

34" sounds about right. This will just be used for making tools like seal/bushing drivers, custom pins and bushings, etc. I've sent out out a lot of equipment parts for that sort of thing over the years to salvage otherwise junk that could be saved with a bit of ingenuity.

No form 1's?

Quote Originally Posted by Fnord5 View Post

No form 1's?

LOL... If it does pan out it may thread a barrel or two.

Quote Originally Posted by G-ManBart View Post

If the spindle bearings are reasonably decent it probably isn't going to be an issue for the type of work he's doing and even if it needs some work the parts are generally available.

Other than being grimy it doesn't look bad at all...heck, the left front corner of the compound doesn't even look nibbled on!

If I saw that machine for $500 anywhere within about a three hour drive I'd be hooking up the trailer to go get it! Hopefully we get to see pics after it's cleaned up...other than the yellow highlights I suspect it's going to look great.

LOL!!!! You'd have to beat me to it

California doesn't allow cans, so I totally don't want a lathe to experiment. But I have a few designs in mind. Lol.
Maybe I can make it a business and sell out of state (I think sparrow was/is a california company that has to actually go out of state to test their products)

I know a guy that bought a kit (for a .22) jumped through all the ATF hoops and paid his $200. when he got his stamp he bored and assembled it. It didn't quiet the .22 much so he tried it on a .223... the pressure pulse destroyed it. No refund from the ATF.

An update on the lathe power issue, I talked to Russ and he suggested a rotary phase convertor feeding a step up transformer. He has some surplus transformers he's checking on (cheap) so for not much more than a new single phase motor I can probably get this going. As a bonus I will be able to run some other stuff either 230 or 460 3 ph...

Mill next?

Quote Originally Posted by G-ManBart View Post

Full disclosure....I have two lathes right now. One is 3-phase being run off a rotary phase converter. The other I converted to single-phase because it had a bad motor...I thought that was a great idea, and I think it will make it easier to sell, but it's really not an ideal solution.

Single-phase motors can cause surface finish issues that mimic tool chatter. The more stout the machine is the less of a problem it is, but it's always a possibility.

Similarly, a 3-phase motor being run on a static converter can lead to vibrations similar to the above, and you lose 1/3 of your available HP.

VFDs are great for many things, but a 230V single-phase in to 460V 3-phase out is going to be expensive, and VFDs have torque loss both above and below 60Hz....and you can't use the machine switches.

One safety thing that comes up is that if you run a single-phase motor on a rotary drum switch you give up the ability to rapidly revers the spindle direction like you can with a 3-phase motor....so if your clothing gets caught in the chuck there is no chance to just smash the drum switch in the other direction and unwind it. No, that's not terribly likely, but something to be aware of.

I bought a nice rotary converter recently and I'm now completely sold on that solution....my bigger lathe, mill and surface grinder are all set up for 3-phase. I'm actually considering re powering my smaller lathe with a 3-phase motor...I think I have a spare 2hp that will work. I can repurpose the 2hp Baldor I have on it, or sell it and make a few bucks on the deal.

If you reverse a three-phase motor it will more than likely take out the breaker or fuse protecting it. The single-phase motor may just keep running in the same direction despite the drum switch.

Sincerely,

William McCormick

Quote Originally Posted by William McCormick View Post

If you reverse a three-phase motor it will more than likely take out the breaker or fuse protecting it. The single-phase motor may just keep running in the same direction despite the drum switch.

Sincerely,

William McCormick

Only time I have ever had a 3 phase motor blow a fuse when reversing was when a forward/down contactor stuck and hitting reverse/up caused a phase to phase short circuit. That was in the hoist motor on an overhead crane that normally handled jogging just fine. But a welded contactor changes all the rules.

10:14 PM

Quote Originally Posted by 12V71 View Post

An update on the lathe power issue, I talked to Russ and he suggested a rotary phase convertor feeding a step up transformer. He has some surplus transformers he's checking on (cheap) so for not much more than a new single phase motor I can probably get this going. As a bonus I will be able to run some other stuff either 230 or 460 3 ph... Mill next?

That should be a perfect setup. The only downside is you'll be looking at a lot of 3-phase machines that are fairly inexpensive as soon as you get it! I recently bought a 6 x 18 surface grinder because it was simply too cheap to pass on. I'm barely over scrap price on this...motor and spindle run quiet.

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Quote Originally Posted by William McCormick View Post

If you reverse a three-phase motor it will more than likely take out the breaker or fuse protecting it. The single-phase motor may just keep running in the same direction despite the drum switch.

I think taking out a breaker or fuse is a reasonable exchange for saving an arm, but that's just me.

The fact that a single-phase motor will keep running in the same direction despite the drum switch being moved is why I brought it up as a safety issue...it won't reverse the motor or even stop it.

My high school shop class has South Bends. I sure miss that, we did some blacksmithing too and tempered a blade. Kids have iPads now, no more shop.

Quote Originally Posted by Xsbank View Post

My high school shop class has South Bends. I sure miss that, we did some blacksmithing too and tempered a blade. Kids have iPads now, no more shop.

When I was in high school (1977-78) our school had 7 lathes alone in the metal shop. Mostly South Bend and a couple of big Clausings. Plus 4 Bridgeport mills and an older Horizontal mill. We had some good stuff.

12V, another good resource if you don't know already is: https://www.practicalmachinist.com/v...h-bend-lathes/. Oiling the wicks on these old lathes is really important. There are rebuild kits available and a good rebuild manual available on ebay for reasonable expense, well worth buying. Jim

I don't see a 1/2 nut for threading.

Quote Originally Posted by jones6780 View Post

I don't see a 1/2 nut for threading.

On the South Bend it's the lever on right of the apron.

Things were slow today from the snow last week, so I got SuperFord out with the flatbed trailer and brought it home. No super big rush to get it going. I would rather research before I jump into things.

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Stupid pics were taking forever to load.

One odd thing I had noticed today is there is no threading indicator for thread starts. Once I have the power worked out then the hunt for tooling begins. I already have a couple of guys watching for a 4 Jaw independent chuck and a steady rest.
The next buy might be a Mill... I can already see that could make some tooling to fit the quick change toolpost, like boring bar holders etc. I knew a guy that built all his own tools, now I see how.

I see you have a mouse-b-gone plugged in... I put a bunch of those around places years ago.... then one day I was in the garage and saw a mouse sitting right next to one of em

Quote Originally Posted by 12V71 View Post

One odd thing I had noticed today is there is no threading indicator for thread starts. Once I have the power worked out then the hunt for tooling begins. I already have a couple of guys watching for a 4 Jaw independent chuck and a steady rest.
The next buy might be a Mill... I can already see that could make some tooling to fit the quick change toolpost, like boring bar holders etc. I knew a guy that built all his own tools, now I see how.

Threading dials go missing pretty regularly. It's such a common thing that there are folks 3D printing them for many popular lathes and selling them on eBay. I just looked and it appears someone is making the one you need for something like $78.

Sending you a PM about steady rests...

Quote Originally Posted by G-ManBart View Post

Threading dials go missing pretty regularly. It's such a common thing that there are folks 3D printing them for many popular lathes and selling them on eBay. I just looked and it appears someone is making the one you need for something like $78.

Sending you a PM about steady rests...

Thanks, Got it.

Bruning Lowlence

South Bend Lathe Will the Lathe Stop Feeding if It Hits Something

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