Rotary ultrasonic machining(RUM) is a mechanical type of nontraditional hybrid machining process that combining the material removal regime of both ultrasonic machining and conventional grinding. By utilizing the RUM of hard and brittle materials, superior processing outcomes can be realized, such as improved material removal rate, reduced cutting force, improved machining accuracy and surface integrity. Since the invention of the RUM, a large number of researches on RUM equipment and processing technology ...