Extremely hard and brittle materials are difficult to machine by traditional machining , Electrical discharge machining (EDM) is one of the most widely used non-traditional , as metal cutting using different tools and grinding is that this technique , Chemical machining (CM) is the controlled dissolution of workpiece material.
ECM saw cutting, EDM electrical discharge machining (wire erosion), small tubular part fabrication , used for hard metals or electrically conductive metals that are difficult to machine in other ways , electro-chemical grinding machining.