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.
Carbon steel blades are hardened to 59 - 60 on the Rockwell scale, stainless blades to 57 - 58. A specialty of Mora is the laminated carbon blade. This is a three part sandwich, with a core of high carbon steel protected by sides of tough lower carbon steel. The core of the laminated steel blades is hardened to about 61 on the Rockwell scale. Normally, I prefer carbon steel over stainless steel, but I have to admit that the stainless Mora knives take and hold an excellent edge. They are made of Swedish Sandvik 12C27 steel, hardened to 57 - 58 on the Rockwell Scale.