I€™m about to make myself a disc powered featherweight (for real this time ). Its going to be a complete new idea (I think).
It will weigh about 1-1.5 kg and have a 1:1 (1:2 max) reduction on a 24 v dewalt motor. It actually isnt a real disc; it€™s more of a ring-shape, supported on each side with 3 ball bearings with inner diameter of about 2 cm each.
This makes the bot quite efficient with its power (no loss because of the disc being just a ring) and strong supports (it will be supported on triangles).
Because of the low weight it wont be too powerful, but the speed of it makes up for that.
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