On May 23, 5:39*pm, "Jim Wilkins" wrote:
I'm trying to repair a partly stripped spare headstock for a South
Bend Heavy 10, as shown on page 2 of this:http://www.neme-s.org/Shaper%20Books...8%20Parts%20Ma...

I haven't figured out how to make the back gear lever K+J, which moves
the eccentrically-located quill shaft in or out of engagement with the
spindle gears. My lathe is 30 years older than that manual and the
spare probably older still, and they don't appear to have a separate
bushing J, the lever and the eccentric bushing look like a single
casting. The shaft is taper-pinned to the eccentric bushings at both
ends so the shaft and bushings rotate together.

I got as far as drilling oversized round stock to fit on the shaft but
now I don't see how to attach the blank for K to O to turn the outer
bearing surface concentric and then move it to the far end of the
shaft without losing rotational alignment. To complicate the problem
the OD at J is 1.250" while O's is 1.625".

It would be easy if I cut key slots in the shaft, K and O, locking
them together while turning J and preserving the angular alignment
when I move K+J to the far end. Can you think of a method that uses
the original hard-to-find SB shaft and part O without damaging them?
jsw

If you measure the distance "off center" for the eccentric, maybe you
can machine the bushing in a 4 jaw chuck with the bushing fastened to
a stub that is set with the same eccentricity. You could make two
eccentric bushings with different diameters. Assuming that the pins
in the shaft are in the same plane, the new eccentric bushings should
be aligned too.