Nikola Tesla in his 60s adjusting a radio device in his lab in New York City. Like most significant inventions, radio had not just one âfather,â but many. British mathematician James Clerk Maxwell first proved the existence of radio waves mathematically in 1864.
Cutting with Rotary Tools. Rotary tools are the most widely used method for cutting composite laminates. Whether you are cutting carbon fiber sheet or a fiberglass hull, there is usually a rotary tool just right for the job. Rotary cutting tools vary from small handheld rotary tools, like a Dremel or pneumatic rotary, to routers and even angle grinders.
Different cutting tool materials used for cutting operations in practice are high carbon steel, high speed steel, non -ferrous cast alloys, cemented carbides, ceramics and sintered oxides, ceremets, diamond, cubic boron nitride, UCON and sialon. 1. High Carbon Steel tools. 1  Its composition is C = 0.8 to 1.3%, Si = 0.1 to 0.4% and Mn = 0.1 to 0.4%. 2  It is used for machining soft metals like free cutting steels and brass and used as chisels etc. 3  These tool loose hardness above 250Â° 4 C. Hardness of tool is about Rc 5  = 65. Used at cutting speed of 5m/ min.