ULTRASONIC VIBRATIONS CAN ENHANCE SUPERFINISHING PERFORMANCE, ALLOWING FOR A REDUCTION OF THE AXIAL STONE OSCILLATION. FOR CONVENTIONAL SUPERFINISHING WITHOUT ULTRASONIC VIBRATIONS, THE STOCK REMOVAL IS GREATLY REDUCED WHEN THE AMPLITUDE OF AXIAL STONE OSCILLATION IS REDUCED FROM 1 MM TO 0.5 MM. HOWEVER, THE LOSS IN PERFORMANCE AT THE REDUCED STROKE LENGTH CAN BE RESTORED OR SLIGHTLY IMPROVED UPON BY THE USE OF ULTRASONIC VIBRATIONS, WITH COMPARABLE STONE WEAR AND SURFACE FINISH.