Quote:
Originally Posted by ChrisM
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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These are the two matching DC motor/reductions that I have in
mind for sharing the load via friction roller or winch or crown gear
type arrangement.
http://www.iceinspace.com.au/forum/s...&postcount=115
They have a DC clutch, DC motor and good , strong set of final
gears.The last gear has a positional encoder on it.
It might seem perfect for the job but a problem I see is if I use
this setup in a shared meshed arrangement, it is so strong that
any problem in one drive would cause the other to keep driving
and possibly destroy the dome base-ring. It's only plywood.
Steve