In essence, gears are just circles with enamel connecting them. A equipment transmits a circular movement among two different shafts by rotating and meshing with another gear on another shaft. Gears come in many different shapes and sizes, which includes spur gear, helical gear, bevel gear, and worm equipment. https://gearbox86307.techionblog.com/33823547/the-2-minute-rule-for-gearbox