Abstract
The purpose of this paper is to clarify the mechanism of drill walking phenomenon. The stability of drill motion is analyzed, by considering the regenerative effect, the dynamic cutting force and the variation of undeformed chip thickness in the primary cutting direction. The results are compared with the experimental results. In the theoretical analysis, a Nyquist's chart of the drill system shows that the vibration frequency per revolution of workpiece is almost an odd number with a phase lag which causes a clockwise rifling mark on the hole wall. Experiments give similar results. Theory and experiments show that decreasing the feed rate, increasing the bending stiffness of a drill and decreasing the equivalent mass of tool result in an increase in the vibration frequency per revolution of workpiece. Therefore, drill walking is a kind of regenerative chatter vibration.
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