Gearboxes or gear reducers alter input speed (mostly received from an electric motor) to a different speed. In most cases, gear reducers reduce the input speed to increase the output torque. There are different types of gearboxes which we have them all: worm, bevel, parallel shaft, helical and planetary. In order to select the gear reducer, one needs to know the gear arrangement, input and output speed, output torque, service factor and output shaft to name a few.