... LAPPING FUNCTATION: SINGLE FACE LAPPING ONLY POLISHING FOR MIRROR FACETHE MACHINE IS ADDED LAPPING POWDER BY HANDS AND CONTROLLED BY TIMEWHEN ... THE TIME IS REACHED, THE MACHINE WILL STOP.USUALLY FOR POLISHING CERAMIC,CARBON,TUNGSTEN CARBIDE,SILICON ... AND GLASSES AND SO ON ceramic rings surface lapping machine, flatness grinding machine, height lapping macine, muller