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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Copying an eccentric bushing
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...s%20Manual.pdf 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 |
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