- Joined
- Nov 14, 2014
- Messages
- 851
Hi all,
We have an old SB 10” belt drive lathe at the Hawaii Railway Society that has some serious issues making chips. Iam not familiar with these older SB lathes, so hoping for some assistance/advice trouble shooting this machine. And whether, the lathe is worth reconditioning. Basically this lathe is an old, well worn tool room lathe surplused out of the Pearl Harbor naval shipyard machine shop, a loong time ago. New in 1942 maybe...
Model: SB 10L - 3 1/2’ bed, with taper attachment. Motor and belt drive mounted in the cabinet, below the headstock
Catalog number : 8187Z
SN: 135111.
MA E127 also shows on the right rear flat portion of the bed.
It currently has two significant problems:
1). Only will do a DOC of around .015” on 1” mild steel stock on middle and lower ranges of the upper gear range (200-300 rpm, Iam guessing). Any deeper cut (feed rate .003”) stalls the machine. As in the tooling just bites into the work and stops the spindle - belts don’t slip, the motor just stops turning. (Iam thinking the motor is worn out and can’t turn the belts any more with load on the spindle???)
2) the spindle locks up when back gear engages the low gears. In low gears, the spindle won’t turn at all when power is applied and the motor tries to spin up. Note: the pin in the bull gear appears to be disengaged. But it is stiff to move in and out, so maybe it is not fully disengaged??
Any thoughts on quick fixes for these two issues???
Thanks much for any assistance you could offer.
Glenn
We have an old SB 10” belt drive lathe at the Hawaii Railway Society that has some serious issues making chips. Iam not familiar with these older SB lathes, so hoping for some assistance/advice trouble shooting this machine. And whether, the lathe is worth reconditioning. Basically this lathe is an old, well worn tool room lathe surplused out of the Pearl Harbor naval shipyard machine shop, a loong time ago. New in 1942 maybe...
Model: SB 10L - 3 1/2’ bed, with taper attachment. Motor and belt drive mounted in the cabinet, below the headstock
Catalog number : 8187Z
SN: 135111.
MA E127 also shows on the right rear flat portion of the bed.
It currently has two significant problems:
1). Only will do a DOC of around .015” on 1” mild steel stock on middle and lower ranges of the upper gear range (200-300 rpm, Iam guessing). Any deeper cut (feed rate .003”) stalls the machine. As in the tooling just bites into the work and stops the spindle - belts don’t slip, the motor just stops turning. (Iam thinking the motor is worn out and can’t turn the belts any more with load on the spindle???)
2) the spindle locks up when back gear engages the low gears. In low gears, the spindle won’t turn at all when power is applied and the motor tries to spin up. Note: the pin in the bull gear appears to be disengaged. But it is stiff to move in and out, so maybe it is not fully disengaged??
Any thoughts on quick fixes for these two issues???
Thanks much for any assistance you could offer.
Glenn
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