Abstract
This report is a continuation of Progress Report No. 1 which was presented in 1947 before the Society. The investigation is principally concerned with the effects of cutting speed upon cutting temperature, chip thickness, and chip hardness, when steel at various hardness levels is machined with cemented-carbide tools. In most of the tests conducted, a steel-cutting grade of carbide tool was used. This type contained tungsten, titanium, and tantalum carbides and is referred to as a triple-carbide tool. A straight tungsten-carbide tool was used in one series of tests in order to compare the performance with that of the triple-carbide composition. The cobalt content of each grade was normal for the particular type and intended cutting service. Details of the tests are given in this paper.
