...Jung-Fa Hsieh Helical drill points provide a superior cutting performance, particularly when drilling microholes. Complex helical drill points retain the advantages of conventional helical drills while providing a further strengthening of the cutting edge. However, no methods currently exist...

...Wei Zhang; Fengbao He; Dilin Xiong This paper presents the design method for complex helical drill point. Different from the conventional helical drill point generated by simultaneous rotation and translation of the drill blank, the complex helical drill point is ground by a supplementary swinging...