The function of gearing is to mesh with other gear elements to transmit altered torque and rotation. In fact, gearing can change the speed, torque and direction of motion from a drive source.
In this Design Guide, the editors of Design World detail the most common gear types for precision applications — as well as the contained gear trains known as gearboxes (those mechanical components consisting of a series of integrated gears) and other iterations to simplify integration and servotuning.