Abstract
From the reconsideration of the merits and demerits of the corner roundness which has been conventionally made at the junction of major and minor cutting edges of cutting tool, it is suggested that the omission of the corner roundness may bring several advantages.
Turning tests of carbon steel with the cutting tools of varied shapes prove the following advantages : Cutting tool without corner roundness
(1) can make the surface finish smoother than that theoretically expected,
(2) can avoid the wear at its end cutting edge or profiling edge, and accordingly, can keep the initial surface roughness for long cutting time, and
(3) tends to produce shortly broken chip in wide range of cutting conditions. Namely, this tool is superior to the conventional cutting tools in the convenience of chip disposal, especially in light cutting.
