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I haven't thought things through yet but these cranks have a spline that doesn't taper and they seem to work with two pinch bolts so I am thinking about doing something similar but maybe more chunky and simpler to make.
Not expecting this to be a business venture mind! I would need to get a CNC lather to make it profitable
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Hulsroy
chiroshi
What kind of travel can you get in the z-direction on a pantograph? Splines are very hard, especially tapered ones. The tolerances needed to get them to work well without overloading one spline or locking together for all eternity is quite a challenge. I look forward to seeing your approach!