Abstract
This paper reveals the main design and technological factors affecting entrance stability and provides practical recommendations on the design of gundrills. The subject has been covered in two parts. In the first part of this paper, the first stage of drill entrance, which begins when the gundrill touches the face of the workpiece and ends when the gundrill’s cutting edges are fully engaged in cutting, is considered. The role of the clearance in the starting bush and the design of the gundrill’s supporting area are analyzed. In this paper, the second stage of gundrill entrance is analyzed. The system engineering approach, which includes the time axis, is used in the consideration of distinctive steps in the drill entrance. The influence of the design parameter of the gundrill (such as relative location of the supporting area and the cutting edges, flank (relief) angle of the outer cutting edge, the location of the rake face, design and location of the supporting area) as well as the clearance in the starting bush on the duration of entrance instability is discussed. A number of practical suggestions to increase the entrance stability are provided.
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