It is used for finishing large quantity of similar parts. Lapping machine involves a rotating lapping plate and conditional rings.The condition ring provides the position for the workpiece, which rotates and rubs the workpiece on the grinding plate.Abrasive particles are provided with suitable medium like liquid or in powder form. This rubbing removes metal in form of microchips and provide super finishing. http://www.szjiuyuda.com/lapping-machine/