The simultaneous circular motion of the tool removes these particles from the working zone. In addition, the continuous separation between tool and work piece, in conjuction with the reduced feed power and lower thermal stress in comparison to conventional methods, leads to aprotection of tool and work piece, Machining is corried out much like conventional milling. Ultrasonic milling makes it possinle to machine finished parts in very hard materials at a considerably faster rate than other mehods such as dimon cutting tools or gringing