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Working on my South Bend 9C

Golem Pens said:
Right, so something like this (I know there are sources/ways to fabricate it, just for illustration) where you register the chuck to the faceplate for concentricity and facing? https://bmpartstech.com/product/logan-er32-chuck-collets-with-1-1-2-8-adapter-for-9-10-lathes/

@Susquatch as for workflow improvements I may spool that into a separate thread. The lack of material strength makes it tricky to do both sides without support I think.
Click to expand...
On your spindle right next to the headstock casting after the threads is a short unthreaded section. This is the register..... your chuck wants to just go over this and come up flush with the end of the register area where it enlarges to the bearing size. Hopefully that makes some sense.....
 
140mower said:
On your spindle right next to the headstock casting after the threads is a short unthreaded section. This is the register..... your chuck wants to just go over this and come up flush with the end of the register area where it enlarges to the bearing size. Hopefully that makes some sense.....
Click to expand...
Gotcha, seems like it butts up right against the face of the spindle shoulder. About 0.6mm diameter difference between the internal/external in the register area.
 

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If lee valley sell those for wood lathes that may very well be good enough. Woodworker don't usually work in thous or tenths of mm. But they are (or have been) very good with returns.
 
Is your chuck hardened? If not, you could take a little off the nose of it, making the taper a little shorter and thus smaller diameter. Then carefully bore out your existing one as though you were just completing the whole thing. 😛
However, before doing this you want to spend a day aligning your lathe bed. No sense cutting your new taper off kilter..... if you have access to toolpost grinder, that would be even better.
 
@Golem Pens call these folks and see if they still have any of the Atlas 4-jaw chucks. They are a perfect fit and size for your lathe.

3 and 4 jaw chucks for bench lathes

6" Atlas original 4 jaw lathe chucks and Bison 5" 3 jaw chucks with 1 1/2 x 8 integral mounts
www.hhrobertsmachinery.com

I can help you with shipping as their shipping costs when I bought a 3-jaw were pretty high.
 
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