Abstract
Temperatures developed in M2 High Speed Steel twist drills have been measured by studying micro-structural chancres in sections normal to the surface using scanning electron microscopy. Only in situations where drill temperatures exceeded 650°C could temperatures be measured. When drilling stainless steels under conditions of very high speed and feed temperatures of 650 C were exceeded. The factors which influence the temperature distribution in drills will be discussed. The advantages and disadvantages of this technique together with future applications will be fully discussed.
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