A broad definition of machinability would be the relative cost per square inch of machined surface when all cutting conditions are at an optimum for most economical production. For several years the J&L tool dynamometer (1, 2) has been used successfully for evaluating a number of factors affecting machinability such as grades of carbides, types of coolants, methods of applying coolants, tool geometry, tool finish, cutting speeds, feeds, and materials. With knowledge of these factors, it is possible to approximate a most economical rate of production. In this paper the relation between changes in loads on tools and tool wear is shown through test results and how, in a short time, with the help of a tool dynamometer, reliable information for successfully machining titanium 150A was obtained.

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