Hi All, I am nearing completion of the restoration on my recently aquired 10" Sheldon lathe. As such, i am looking around at my tooling and accessories to see what i can transfer over to use on the Sheldon. The lathe came with what looks to be a decent 3 jaw chuck. I also put my hans on (from a different source) a nice old SB 4 jaw. The backplate on the 4 jaw appears to have the same thread as the Sheldon spindle, except that the portion of the backplate that threads onto the spindle is not as deep. As a result, the spindle threads will hit the back of the chuck before the boss on the back of the backplate seats onto the spindle face. There is a photo that shows the chuck on the spindle as far as it will go, here:
My question is this: is there any reason that I could not just add a "ring" of sufficent thickness to the 4 jaw plate (screwed or pinned in place) that it would add enough depth to the boss to allow it to seat properly? Or would I simply be better off getting or making a new backplate? Any other ideas?
Thanks for any thoughts, AL A.