3D-printed gears should work just fine. As long as you don't drop or crash the machine. There is a groups.io group for that purpose (among other) that I happen to own. /g/3D-Printing-for-Metal-Hobbyists/topics
From what I've read, ABS or Nylon would be good choices. That's from investigation a couple of years ago, so there may be better choices now. Metal gears from Boston Gear can run upwards of $100 each. Having the gears printed I couldn't tell you what it would cost now, but if you have your own 3D printer and the necessary computer files, you can print them yourself. My printer, with an Atlas TH42 style gear for metric transposition looked to have at least a 24 hour print time for one gear. Looked like it would use about half a roll of ABS filament. At the time, I had about $21-23 in rolls of the ABS filament. I didn't have the files for the South Bend Heavy 10L, though I did have them for my Atlas. You may be able to find them on Thingiverse. I did. If all else fails, you could use 3D printed gears until you can collect the proper steel/iron gears.
On the screw, you can get a blank from McMaster-Carr. If your leadscrew needs the keyway the length of the leadscrew, you'll need to find someone to mill it for you. Depends on the size/length you need for your cost. Grainger may have the material, too. I haven't checked on them yet, though I do have one local to me. Seems to me one of the members here can do it, you'd have to talk to him about cost. Guenther Paul is the member I'm talking about, and I know he belongs to several of the other SB lathe groups, just not sure if he's here, too.
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
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On Thursday, July 15, 2021, 10:11:03 AM CDT, pwoolybul via groups.io <pwoolybul@...> wrote:
I bought a South Bend 9c lathe that had been dropped. The screw and idle gears have be broken. Does anyone know were to get one or will a 3d printed gears work as a replacement.? Also if 3d printed gears will work what printing materials should be made of. Any help here would be very helpful.
Bill in OKC too