Quote:
Originally Posted by asid61
Not exactly. So if you look at the Team221 Revolution Pro, you'll notice that there is 1 vertical bevel gear that's coaxial with the rotation of the module, and 1 horizontal bevel gear.
Essentially, instead of using just 1 horizontal bevel gear, if you use 2 on opposite sides of the vertical bevel, the vertical bevel gear applies force in two opposite directions and won't cause the module to rotate. Granted, this gives you the issue of having the two horizontal bevel gears rotating in opposite directions so you'd have to cantilever them, but it would guarantee (in theory) that nothing moves when you don't want it to.
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On this, I was thinking something a bit different. That is, there would be two concentric shafts, counterrotating at the same speed. The outer shaft would end above the wheel axle, with a bevel gear with downward-facing teeth. The inner shaft would end the same distance below the wheel axle, with the teeth facing up. The output bevel gear would engage both bevel gears on the shaft.
Actually, to make this a proper caster and to allow for two wheels, one on each side of the drive shaft, the gears would not be true bevels, but would allow an offset angle so that the wheel axle is behind that shaft.
If you have the capability to make or buy such gears, it might work.