Speed and Feed Selection in Carbide Milling With Respect to Production, Cost, and Accuracy

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Abstract
The present paper reports findings of a research on milling cast iron with carbide-tipped cutters in addition to those presented previously in 1945 by Michael Field and W. E. Bullock. An important finding of the earlier work was the existence of a definite maximum tool-life point, i.e., at 290 fpm, in relationship of cutting speed to tool life, when milling a cast iron of medium hardness (Bhn 190). Subsequently, it was found that a similar maximum tool-life point, i.e., 200 fpm, occurs when milling a considerably harder and less machinable cast iron (Bhn 240). An important outcome of the earlier phases of the research was the development of a combination of tool angles which gave much greater tool life and a considerably higher production rate. The original work was done with single-point tools, whereas a multitooth cutter was subsequently developed, details of which and the results obtained are included in the paper. A comprehensive account is given of the recent studies, illustrated by numerous test curves, and a practical analysis of milling costs.

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