Screw joints on drivetrains reduce friction considerably. Instead of a shaft, they use a screw and free-spinning inserts (though you can’t attach this to a motor) on gears not connected to the motor. Here is a post:
Screw joints on drivetrains reduce friction considerably. Instead of a shaft, they use a screw and free-spinning inserts (though you can’t attach this to a motor) on gears not connected to the motor. Here is a post: