While drilling at greater feed, the resistance offered by work material in the direction of drilling is greater, thus leading to greater friction which increases the TF. ![]() ![]() This was due to an increase in the cross-sectional area of undeformed chips. ![]() It is observed that the TF increases with an increase in feed. The main effect plot of TF for feed is shown in Fig. This fact was due to steps in the diameter of the center drill bit and the parabolic flues allow chips to flow easily. The center and parabolic drills generated almost the same TF. ![]() It was observed that the higher TF is generated for the plexi point drill bit than the center and parabolic drills. The main effect plot of TF for tool geometry is shown in Fig.
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