Excerpt from The American Steel Worker: A Twenty-Five Years' Experience in the Selection, Annealing, Working, Hardening and Tempering of Various Kinds and Grades of Steel
An experience which covers twenty-five years of actual practice, in the various branches of machine shop work, has taught the writer that much more depends on the condition of the various cutting tools used, than mechanics in general realize.
The various machines used in working iron and steel to shape have been improved, and made heavier in the parts subjected to strain, in order that heavier cuts and faster feeds might be taken to reduce the cost of production.
If a tool is doing the maximum amount of work possible for it to do, when it is used in a light machine, it would be folly to purchase a heavier, stronger machine and use the same tool in it. But it has been found in many cases that cutting tools could be made that would take heavier cuts and faster feeds than the older types of machines could carry. Consequently it has been necessary to re-design most types of machines used to remove stock, in order to bring them into shape to be used as tools, parts of machines, and other apparatus.
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