Abstract
This paper describes the influence of cutting conditions on hole shape accuracy in deep-hole machining of stainless steel with a small-diameter drill. Drilling tests were carried out by changing the feed, tool material, cutting fluid supply method, and step feed to investigate the most appropriate cutting conditions for drilling of deep holes. The results indicated that an increase in thrust force leads to buckling of the drill and work hardening of the workpiece causes tool failure. To solve these problems, cutting conditions with no buckling and high straightness were investigated. Finally, drilling a hole with L/D = 100 (diameter: 2 mm, hole depth: 200 mm) was achieved.
