This document discusses non-conventional machining processes. It introduces abrasive jet machining and ultrasonic machining. Abrasive jet machining uses abrasives propelled by high-velocity gas to erode material from hard or heat-sensitive workpieces. Ultrasonic machining involves a vibrating tool that oscillates at ultrasonic frequencies to remove material from the workpiece with help from an abrasive slurry. Both processes allow machining hard materials with less heat and damage compared to conventional processes. They are often used for intricate shapes or specific edge shapes due to their flexibility and ability to machine difficult materials.