Introduction 1 History of ultrasound 2 The current state in the rotary ultrasonic machining 2.2 Research in the field of ultrasonic machining 3 Prognoses in the field of rotary ultrasonic machining 4.1 Ultrasonic undulation 4.2 Damping of the ultrasound 4.3 The principle of machining by ultrasound 5 The...