Ultrasonic-vibration-assisted grinding (UVAG) is a hybrid machining process which combines diamond grinding and ultrasonic machining. With impact mode produced by ultrasonic vibration, grinding mode produced by tool rotation, erosion mode produced by both ultrasonic vibration and tool rotation, and the fatigue of workpiece surface layer produced by high-frequency ultrasonic vibration, the core drill with metal bonded diamond abrasives removes material from workpiece with lower cutting force. Therefore, UVAG...