South Bend 9 lathe Clutch issue

[mattthemuppet2]

A second smaller question, the tailstoxk locking level is missing. I ran a 5/16” threaded bolt into the insert, but it did not tighten down the tailstock spindle. So Iam thinking, the spindle locking nut is likely frozen in the tailstock casting. Can this be pulled out with a bearing puller? Or is there some kind of locking spline or cam inside the housing, that has gotten twisted somehow, preventing movement?? Don’t want to break the casting trying to pull against some physical obstruction inside the trailstock.

the tailstock barrel/ spindle lock is a 1/2 wedge - the bit under the lever slides down in its bore to clamp against the barrel/ spindle. Take the barrel out, tap it down gently and add oil, then lever it up a bit from inside the tailstock. Keep doing that and it'll free up.

Not sure about the '25 version, but the '29 I have is a New Model Precision 9" lathe according to SB. The workshop moniker didn't arrive until the introduction of the new style narrower bed 9" in A, B and C versions.

 

[Glenn Brooks]

So the Workshop model is the latter version...

Edit: so I just searched Steve Wells site and read through the early 1904-1930 SB catalogs he has complied there.

Looks like SB introduced the 9” series lathes sometime after 1914 and prior to 1923. These series of lathes are described in their “Junior Lathe” series catalog No. 44 (circa 1914) and No. 79 (1923). However, in November, 1928, SB introduced a “new model 9” Junior” lathe, (seeCatalog no 23) having fewer features, a new semi steel bed, and a wider apron.

Later, in March, 1931, Catalog No.22-c, SB introduce, for the first time, their newly designed and improved “new model Junior 9” lathe”. This new 9” “Junior lathe” was built from their existing 9” standard change gear components, but with a wider cone pulley, and without the automatic cross feed function, friction clutch, large face plate, center rest, traveler rest, or quick change gear box.

Hence, the “Junior” designation appears early on to refer to their introduction of an entirely new, smaller sized 9” lathe, (Junior to their early smallest 11” lathe). Then in 1928, they introduced a new 9” Junior Lathe design, as a stripped down, production lathe, having less tooling than their fully equipped, standard 9” lathe product line. Apparently, SB refined their marketing approach and model designation as they made incremental improvements in lathe design and expanded their product line.

They also changed specific model numbers in successive Catalogs, as they added features, or changed their design. For example, my 1925 9” Lathe is listed in Catalog No. 79, as model 61-A. “61” referring to a quick Change Gear Box lathe, having “-A”, a 4’ bed length. 7 years latter, Catalog no. 22-c identifies the modified version of this lathe as model number “82-A”.

Matt, thanks for the info on the tail stock. Much better than trying to extract with a bearing puller.

Any tips on disassembling the clutch assembly. The little shaft that holds the star knob seems to be seated pretty tightly into the clutch. I can only unscrew the backing nut a turn or so before everything binds up. Still need to pull the apron off the shaft to get at the backside.

Glenn

 

[mattthemuppet2]

just had a quick look and you'll need to take the bracket holding the worm off, then you can either remove the inner part of the clutch (male cone from memory, rides inside the worm gear) with a pin spanner or you can remove the hand wheel and undo the assembly from the handwheel side. I honestly can't remember too much about how it goes together, only that it wasn't that complicated. On mine I think the screw was stuck, so the clutch couldn't be loosened, but it was easy to take apart.