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Steve, do you know the specs of your drives? ie. rpm & torque? I have calculated that I need a torque of around 3 - 5 Nm although incorporating a margin above that range is probably advisable. And I think a speed of around 50 - 60 rpm for the output shaft should translate into an acceptable dome speed. On the internet I found the CMG geardrive "sub-fractional" horsepower units which employ single phase 240 Vac motors.
To get traction, I am thinking that a soft rubber wheel might provide the necessary "grip" on the steel ring, but there may be other solutions.
Thanks for the tip Greg re Brett.
Chris
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