Gears are circulating machines with cut enamel of various sizes. They transfer the torque and speed from a single shaft to another. Transmission of torque will depend on two points: the enamel of gears and the sizes of enamel.   This sort of transmission fails to hold the identical diameters https://gearbox41863.ltfblog.com/32625059/the-definitive-guide-to-gearbox