Facing (machining)

In machining, facing is the act of cutting a face, which is a planar surface, onto the workpiece. Within this broadest sense there are various specific types of facing, with the two most common being facing in the course of turning and boring work (facing planes perpendicular to the rotating axis of the workpiece) and facing in the course of milling work (for example, face milling). Other types of machining also cut faces (for example, planing, shaping, and grinding), although the term "facing" may not always be employed there.