 A typical MPG consists of a rotating knob that generates pulses that are sent to an equipment controller.The controller will then move the piece of equipment a predetermined distance for each pulse.For example, the handwheel of a typical CNC control will move any of the slides of the machine by one minimum increment, such as 1 micrometre or 1 ten-thousandth of an inch, for each pulse, and the handwheel will give one ratchet-like click or other haptic click to confirm to the user that a single increment occurred.