Toolmakers Kinks (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Toolmakers Kinks

Who has not Often seen a machinist pick up a bar Of metal covered with rust and dirt and wonder whether it was tool steel or machine steel. Now, there are a number of means of finding this out, but the emery wheel test, while not a particularly refined method (it will not tell you everything about a steel) is as quick and handy as any. To test a piece, touch it lightly against a dry emery wheel and observe the sparks as they strike the frame of the machine. A high-carbon steel gives a spark which appar ently bursts into a brilliant star-like point of light when it strikes against anything. The spark from a low-carbon steel is, on the contrary, merely a dull, incandescent particle. It is said that all the air-hardening steels give a very red spark. By the way, some air-hardening steels can be greatly improved by heating to a bright.

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