South Bend Lathes 9N and 10K also 9K & 8

Re: Is 1/2 HP really enough?

ka9egw@... (Brian) — Fri, 07 Feb 2025 08:07:37 -0800

I'll second that...my late-80's 10K I got so sick of the original Texalon belt jumping off the pulley step, I replaced it with a new real leather belt...no improvement...I decided to buy a v-belt spindle pulley and machine a v-belt countershaft pulley and that turned into it's own brand of nightmare [never trust eBay vendors selling bandsaw drops unless the material is verified]...

Anyway, so I put a serpentine belt on, skived and glued, and the 1/2HP Leeson single phase motor [running in back gear and slowest step] will stall out before the belt jumps or slips.

So now I can make my v-belt CS pulley from this piece of unidentifium [might be 4130, 4140, A2 pre-hard, or Cor-Ten, who knows?] but now I question whether I need it...

Re: 9" 1925 South Bend Lathe

johnwa27@... (John Walker) — Fri, 31 Jan 2025 15:09:23 -0800

Joe

There is a 1934 edition of “How To Run a Lathe�� on the internet archive.

https://ia802306.us.archive.org/34/items/how_to_run_a_lathe_1934/how_to_run_a_lathe_1934_big.pdf

It lists the countershaft speed as 255 rpm for a 9�� lathe.

John

New group for small lathe users on projects

davesmith1@... (davesmith1800) — Fri, 31 Jan 2025 09:45:13 -0800

New group for small lathe users and fun things to do on lathe.

Open for other topics on using your new tools around the home and other hobbies

Right now we are talking about setting and using a rotary table on a small and using the lathe as second mill.

This is a decisiondiscussion group for all.

Hope see everyone on

/g/minilathe/messages

Re: 9" 1925 South Bend Lathe

exupjim@... (James Thornton) — Fri, 31 Jan 2025 05:26:01 -0800

Hi Joe,

Ok, maybe I misunderstood a bit. I thought you were proposing to move from a vee belt arrangement to a flat belt for some reason.

Although it would seem natural that you would run a flat belt over a flat pulley, this often isn't the case. Maybe because most countershafts of the time were originally designed for overhead lineshafting, they retained the flat pulley but this was paired with a vee belt when the setup was adapted for an electric motor. The motor has a vee pulley, but the flat pulley on the countershaft remains as is.

Here is my Hansen lathe setup. The motor isn't original, and I have since sorted the loose wires, but the vee belt running over a flat pulley is original: https://lathes.co.uk/hansen/

It works really well with no slip.

Re: 9" 1925 South Bend Lathe

jguidry@... (Joe Guidry) — Fri, 31 Jan 2025 04:20:08 -0800

James, the machine came with flat belts, I will say again that the large drive wheel that is on the counter shaft that lines up or goes on the Motor side pulley is a flat belt, it would stand to reason that there would be a flat drive on the motor, all I was trying to find out if anyone had one or knowledge of the size of the flat drive that goes on the motor, guess I will make several to see which one would be the best, thanks, Joe

On Wed, 29 Jan, 2025 at 6:56 AM, James Thornton via groups.io <exupjim@...> wrote:

To: [email protected]

It was very normal to have a vee belt pulley on the motor, driving a vee belt, that then ran on a flat pulley on the countershaft This was true even on original lathes from the 1920's.

They work much more efficiently, especially around a small pulley, and over a short span.

Why would you want to go to a flat belt? You would have to tension it like mad to stop it slipping, probably distort the countershaft which won't be designed fornthe load.

Re: 9" 1925 South Bend Lathe

jguidry@... (Joe Guidry) — Thu, 30 Jan 2025 04:24:39 -0800

ok, wrong place, yes my large pulley on the counter shaft that goes down to the motor is a single pulley, would have to use back gear if I want to thread slow, thanks, Joe

On Wed, 29 Jan, 2025 at 8:05 AM, Rick via groups.io <vwrick@...> wrote:

To: [email protected]

Re: 9" 1925 South Bend Lathe

jguidry@... (Joe Guidry) — Thu, 30 Jan 2025 04:20:32 -0800

Thanks John, that looks very similar to mine, I have the change model and all the gears, yes at that date (1925) it probably was a line shaft machine, I have a Sidney that was just changed over it was a line shaft (1890-1910)

On Wed, 29 Jan, 2025 at 10:42 AM, John Walker via groups.io <johnwa27@...> wrote:

To: [email protected]

There are some pictures of a 1925 SB on vintage machinery. It uses a flat belt from the motor. It could easily have been driven by a line shaft which might explain the flat belt.

http://www.vintagemachinery.org/photoindex/detail.aspx?id=41229

John

Re: 9" 1925 South Bend Lathe

jguidry@... (Joe Guidry) — Thu, 30 Jan 2025 04:14:01 -0800

Thanks John, I will look thought the and see if I can see what the Motor pulley looks like and of course save to file, thanks, Joe

On Wed, 29 Jan, 2025 at 11:13 AM, John Walker via groups.io <johnwa27@...> wrote:

To: [email protected]

Joe

I found this catalog at vintagemachinery.org.
http://www.vintagemachinery.org/pubs/1617/31870.pdf

Do any of these look like your lathe?

John

Re: 9" 1925 South Bend Lathe

animal@... (mike allen) — Wed, 29 Jan 2025 13:47:13 -0800

That's the first one I've seen with a flatbelt from motor to counter shaft . Looks like the countershaft is out on alignment in that second pic . Is that a 9B or one of I think a " O " model ? That apron has one m ore knob the I've seen on other 9"s . Yea I just looked at the first pic closer & that one has the 2 bolt bearing caps . it also looks like it may have a brake internal to the countershaft pulley ?

thanks for posting

animal

On 1/29/25 8:42 AM, John Walker via groups.io wrote:

Re: 9" 1925 South Bend Lathe

animal@... (mike allen) — Wed, 29 Jan 2025 13:23:39 -0800

All the lathes I've seen go from V-belt pulley on motor to Non V as the Driven pulley on the countershaft .

On 1/29/25 4:56 AM, James Thornton via groups.io wrote:

Re: 9" 1925 South Bend Lathe

exupjim@... (James Thornton) — Wed, 29 Jan 2025 09:16:40 -0800

Hi John,

That picture shows what apparently used to be a line shaft countershaft unit. You can see the brackets for the fast/loose pulley shifter.

If you look on eg this page, you can see an example of what I mean about the vee belt onto flat pulley setup; https://www.lathes.co.uk/southbend9-inch/

Both my old lathes have original setups which use this arrangement. One from 1929, the other from 1940-ish.

Of course it's possible to use a flat belt from the motor, but it's not as efficient, requires higher tension, and is no more 'correct' or 'original' than the vee belt setup. Personally I wouldn't recommend changing to a flat belt in this application.

Re: 9" 1925 South Bend Lathe

johnwa27@... (John Walker) — Wed, 29 Jan 2025 09:13:14 -0800

Joe

I found this catalog at vintagemachinery.org.
http://www.vintagemachinery.org/pubs/1617/31870.pdf

Do any of these look like your lathe?

John

Re: 9" 1925 South Bend Lathe

johnwa27@... (John Walker) — Wed, 29 Jan 2025 08:42:21 -0800

There are some pictures of a 1925 SB on vintage machinery. It uses a flat belt from the motor. It could easily have been driven by a line shaft which might explain the flat belt.

http://www.vintagemachinery.org/photoindex/detail.aspx?id=41229

John

Re: 9" 1925 South Bend Lathe

vwrick@... (Rick) — Wed, 29 Jan 2025 06:04:54 -0800

On Wed, Jan 29, 2025 at 07:04 AM, Joe Guidry wrote:

Rick, guess I did not explain what I was asking correctly, let me explain what I have and the question that I organelle asked, the one that I have has a "V" belt pulley on the motor, the belt goes up to a larger pulley that is a flat belt drive and has the three strep counter shaft pullies, all flat drive, I was just trying to find out if anyone would have known the size of the flat belt pulley on the motor that all., thanks, Joe

Joe, that wasn't a reply to you. It was a response to Animal, the post I quoted. He said he never uses the slow speed pulley. I use that every time I thread.

That said, the 2 step flat pulley on my 1947 SB9A is 10" on large side, 9" on small side.

Re: 9" 1925 South Bend Lathe

exupjim@... (James Thornton) — Wed, 29 Jan 2025 04:56:10 -0800

It was very normal to have a vee belt pulley on the motor, driving a vee belt, that then ran on a flat pulley on the countershaft. This was true even on original lathes from the 1920's.

They work much more efficiently, especially around a small pulley, and over a short span.

Why would you want to go to a flat belt? You would have to tension it like mad to stop it slipping, probably distort the countershaft which won't be designed fornthe load.

Re: 9" 1925 South Bend Lathe

jguidry@... (Joe Guidry) — Wed, 29 Jan 2025 04:14:54 -0800

I am talking about the Pulley that is on the motor shaft that belt would turn a single flat drive pulley that on the opposite end is the triple drive (counter shaft" that goes to the three shives on the lathe spindle, yes if you have anything that can help, jguidy@...

Re: 9" 1925 South Bend Lathe

jguidry@... (Joe Guidry) — Wed, 29 Jan 2025 04:04:36 -0800

Rick, guess I did not explain what I was asking correctly, let me explain what I have and the question that I organelle asked, the one that I have has a "V" belt pulley on the motor, the belt goes up to a larger pulley that is a flat belt drive and has the three strep counter shaft pullies, all flat drive, I was just trying to find out if anyone would have known the size of the flat belt pulley on the motor that all., thanks, Joe

Re: 9" 1925 South Bend Lathe

vwrick@... (Rick) — Tue, 28 Jan 2025 12:53:56 -0800

On Tue, Jan 28, 2025 at 03:15 PM, mike allen wrote:

Looks like a standard countershaft pulley . I've had & used my 9A for many , many years & have never moved the belt to the smaller pulley on the motor .

animal

Do you ever cut threads?

Re: 9" 1925 South Bend Lathe

animal@... (mike allen) — Tue, 28 Jan 2025 12:15:34 -0800

Looks like a standard countershaft pulley . I've had & used my 9A for many , many years & have never moved the belt to the smaller pulley on the motor .

animal

On 1/28/25 7:54 AM, John Walker via groups.io wrote:

Re: 9" 1925 South Bend Lathe

johnwa27@... (John Walker) — Tue, 28 Jan 2025 07:54:23 -0800

Here’s a picture.