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Smithdoor,Consider one of these.....a lot less work, and one less machine. A lot will depend on how you index you lathe spindle, but that is cover ad nauseam elsewhere.I built this one for my Logan, but I think it's going to go live on the southbend in the future.The plans for this one called for 7/8 shafting. No where near stiff enough. I'd go 1 1/8" in future.Yes it's lever feed....and I use it primarily for key slots but for small pitches, it would cut an internal gear.
<snip>Yes it's lever feed....and I use it primarily for key slots but for small pitches, it would cut an internal gear.<image snipped>
Hydraulic would be over kill a geared drive would be sufficient. gear it down and drive it with a crank you're only taking light cuts anyway....Dave
For a very simple solution to cutting small gears and splines, you couldn't have an easier arrangement than this set up of converting the ordinary lathe top slide, Myford in my case, to make a quite robust lever driven slotting slide. Any sort of convenient tool holder could be arranged to fit in or substitute for the usual tool holding device. Dave