Abstract: The effect of drilling parameter such as spindle speed , feed rate and coolant ratio for obtaining optimum perpendicularity for materials EN8 ,EN24 &EN31 as a work piece materials using cobalt alloy steel drill with point angle 135° and helix angle 30°.This study shows that how significant the drilling parameter are for obtaining optimum perpendicularity . Analysis of variance (ANOVA) was carried out for perpendicularity and their contribution rates determined optimum cutting conditions for least perpendicularity defect obtained by using design of experiments (DOE) methodology for achieving optimization using Minitab 16 software.
Keyword: Machining process(Drilling), Perpendicularity, EN8, EN24, EN31.
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