Abstract
In order to effectively control chip disposal in finish turning, a specially designed tool, Helicoidal Faced Cutting Tool (H. F. T.) of which side rake angle is continuously varied from positive to negative towards the tool point, has been developed. The twisted face makes tightly curled chips in a definite direction which are easily broken in adesirable length. Firstly, the mechanism of chip formation with the twisted face has been studied in two-dimensional cutting of copper alloy tube. In finish turning of low carbon steel with H. F. T., it has been clarified that the effect of twisted face is highly emphasized at a larger rake angle gradient than 20 deg/mm, and the tool effectively works even in the combination of feed rate lower than 0.05 mm/rev and depth of cut smaller than 0.5 mm.
