View Full Version : 9" South Bend Spindle

10-28-2006, 08:39 PM
Some of you guys have said that these lathes have a non standard taper in the spindle.
On page 64 of the South Bend book "How to run a lathe" they say South Bend lathes use a "standard" Morse taper in both head and tail stocks.

Just curious if this is a misprint or has somebody reworked your spindle at

Regards Graeme

10-28-2006, 08:47 PM
the 9" lathes have standard mt3 tapers in the headstock, 2mt in the tailstock, well nearly all of them. Not going to say ALL of them because SB did make a lot of different lathes.
Some of the larger lathes were the ones with non standard tapers.

10-28-2006, 09:48 PM
My SB9 has a MT3 spindle. I haven't heard of anything else being used.

10-28-2006, 10:38 PM
The early lathes all used standard Morse taper in the spindles. Later production 10" & larger used a non standard that is a kind of a Morse taper.

I am not sure when the change was made, probably 60's or later.

10-29-2006, 03:37 PM
my responce same as Evans

10-30-2006, 09:34 AM
My South Bend spindle is of their propretary dimensions. No M/T center will fit my spindle without the adapter.

All of the S/B Fourteens that we had while I was in school were of their propretary dimensions also. No M/T center would fit those spindles without the adapter either.

I highly doubt the spindle in my 1939 Model 159Z was re-worked.

10-30-2006, 09:55 AM
That only applies to the SB lathes larger than 9 inches. AFAIK, all the 9" lathes are MT3.

10-30-2006, 10:19 AM
That only applies to the SB lathes larger than 9 inches. AFAIK, all the 9" lathes are MT3.

I would suppose that this statement is true as my 159Z has a 9 1/2" swing.

When SBL was still SBL, I was looking for information on my then new aquisition. I gave them the information off of the specifications plate. I was told "we didn't make too many that model."

10-30-2006, 10:41 AM
Actually, the 9" South Bends are not 9", but 9-1/8" & 9-1/4" depending on model.

I do recall mention of an intermediate 9" lathe that existed for a short time before being enlarged to become the light ten or 10K. In the mid thirties, South Bend did not make a 10", just the 9" models. The next larger was an 11" machine.

10-30-2006, 11:02 AM
Yep, my SB9 will just make 9 1/8" over the bed. I suppose that is a relic of the days before exaggeration of the capabilities of a product. These days you buy a 26' tarp and it's only 24 1/2 feet long.

10-30-2006, 11:52 AM
... These days you buy a 26' tarp and it's only 24 1/2 feet long.

I have seen on the packaging, the ??'X??' are "dimensions before finishing".

10-30-2006, 12:06 PM
I have seen on the packaging, the ??'X??' are "dimensions before finishing".

Uh huh. Before finishing ripping off the customer that is. The hem is no more than a couple of inches at each end but the last tarp I bought was a full 1 1/2 feet short.

10-30-2006, 12:46 PM
Before finishing ripping off the customer that is.

Perhaps, they rough out the material in meters, finish in feet. After all the meter is only 3.657" LONGER than a foot.

That MUST be why your tarp is short.

I'm not sticking up for them. It's happened to myself too.

10-30-2006, 01:01 PM
The main point is that a 9" SB will really take 9" material with a bit of clearance to spare. Recently that was very nice to have when I was turning a cast iron pulley for a low speed grinder that I adapted from a shaker table. The pulley was a just a red hair above 9" diameter and fit with maybe .020 to spare.

10-30-2006, 06:10 PM
I believe the 10 L (heavy 10) and larger southbends have a Yarno taper in the spindle, 12 or 13 I think, and come with an adapdter to take a M.T. centre. My new to me Harrison also has a 13 yarno spindle taper, and it is fairly new manufacture (1969).

07-21-2013, 04:26 PM
I have a copy of the South Bend catalog and it says that the spindle taper on the 9" is an MT2 but that is definitely wrong.

07-21-2013, 05:18 PM
That's "Jarno taper." My 1967 SB catalog says the 10L takes a MT2 center, but that is clearly with some sort of adapter sleeve because the spindle bore is 1-3/8".

07-21-2013, 06:27 PM
What was the point of a non standard taper if the lathes had to be sold with an adapter? Were the lathes not sold with the adapter and all the tooling accessories that were offered at the time for the spindle in the appropriate spindle taper?

J Tiers
07-21-2013, 11:09 PM
One point of the adapter is that you can use a much smaller center without stacking up adapters (and errors) to get there. That saves length between centers, since bigger centers are longer as far as "stickout", particularly if they are "grinder type" centers, with room for a dog driver to clamp on.

But, if they hadn't wanted to be "special", they could have put a standard taper type in, and used an adapter from that. But they all had to have their own, and sell the parts. Like indicators, guns, etc, and special screws.

Rivett had a special tailstock taper.... not Morse, not Jarno, not B&S, but Rivett.

07-21-2013, 11:27 PM
I have my own taper, and my blue tarp really stinks. I don't care if it's short, it's going in the garbage :)