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Re: High torque that can be purchased.
If spur gears are too pricey, then chain and chain sprockets.
Our arm is powered by a window lifter motor, with about a 4:1 reduction using gears, then another 5:1 reduction using sprockets.
I can imagine using a toughbox or similar from the RS775 to 2 or 3 stages of sprocket-based reduction.
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