A backgauge is a mechanical system, normally attached to a brake press. Its main function is to interface with the brake press computer numerical control (CNC), moving along several different axes in order to position a piece of metal for forming.
Backgauges typically have anywhere from 1 to 6 axes of movement. Each of these individual axis is controlled by a separate electric motor. Often a brake press is sold to a customer in conjunction with a backgauge.
On an extrusion saw, a backgauge is responsible for feeding material at exact amounts past a saw blade. It is responsible for the accuracy of the piece's cut length.
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As the name suggest gauge means measuring exact,so back gauge provide direction to the workpiece coming outward of the machine after cutting operation.