Toolmakers Kinks (Classic Reprint)

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Excerpt from Toolmakers KinksWho 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.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.