Facing (车端面) Facing,also carried out on a lathe generates a flat surface,normal to the axis of rotation,by feeding the tool from the surface towards the center or outwards from the center. A characteristic of this operation is that the cutting speed varies continuously, approaching zero towards the center of Figure 13-28.Toolholders.A-Straight,left-hand,and right- the bar hand toolholders.(J.H.Williams and Co.)B-A turret-type tool- holder with four cutter bits.(ENCO Mfg.Co.)Facing (车端面） Facing, also carried out on a lathe generates a flat surface, normal to the axis of rotation, by feeding the tool from the surface towards the center or outwards from the center. A characteristic of this operation is that the cutting speed varies continuously, approaching zero towards the center of the bar