Making and Using Handtools


Toolmakers' Kinks by F. H. Colvin and F. A. Stanley, 1907


The kinks and other information given in this book have been selected from the experience of thoroughly practical men, as originally published in the American Machinist.

This volume forms one of a series of this nature, aiming always to make available out-of-the-way information when most wanted. In this form the Kink Books, which can be kept in the tool-chest or the pocket, and always referred to, will, we feel, meet a demand and serve a good purpose.

F. H. Colvin and F. A. Stanley
New York, November, 1907.

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 apparently 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 red and quenching in oil. In grinding after this care should be taken not to start the color.



Coes Wrench


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