An experimental study of drill life

Abstract
Response surface methodology is used to develop an equation to predict the effect of feed, speed, point angle and nominal relief angle on the life of an 0·625 in. diameter, two-flute, jobber series twist-drill when drilling a cold-rolled, manganese steel to specification K1045. Important aspects of the experimental design, method and analysis are discussed and the variability about the moan drill life is established.

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