The influence of cutting parameters, tool geometry, and tool material on the performance of high-speed steel milling tools has been investigated using specially designed single-tooth test equipment. A number of wear mechanisms were identified, the relative importance of which depends on cutting conditions and tool material. For a high-speed steel with toughness sufficient to resist edge chipping, tool life increases drastically for a constant metal removal rate with increasing feed per tooth. The possibility of increasing the content of alloying elements while retaining toughness, offered by powder-metallurgy techniques, was found to give a significant improvement in tool life.
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