Abstract
In this paper, a model for the tool life of the main lips of spade drills in the spade drilling of ductile materials is developed. The influences of the feed, speed, and arbitrary drill point angle with or without chip-breaker slots on the tool life of the spade drills are deduced. The model, based on the few experiments, can predict qualitatively and quantitatively the tool life of spade drills with variations in feed, spindle speed and drill point angle. Experimental data obtained in the dry drilling of mild steel by HSS spade drills are shown to be in good accord with theoretical deduction.
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