PURPOSE: To increase thickness in the edge tip part of a cutting tool so as to prevent vibration in an edge tip line in cutting raw wood by conducting multiple-surface chamfering on both front and back surfaces of the cutting tool surface into circular arcs.
CONSTITUTION: Setting the edge tip of a cutting tool 2 as a center, a rotary grinding wheel 45, whose angle can be optionally changed by means of an angle setting device 20, for an edge front is arranged on the edge front side, while a rotary grinding wheel 45, whose angle can be optionally changed, for an edge back is arranged on the edge back side, and the rotary grinding wheels 45 are opposedly arranged in a traveling body 7 traveling in the longitudinal direction of a fixed table 1 while their phases shifted in the longitudinal direction of the cutting tool 2 from each other. By means of the pair of rotary grinding wheels 45, both of the front face and the back face of the cutting tool 2 are multiple-surface chamfered into circular arcs. Then, both of the edge front and the edge back faces are copyingly finished by means of a buff member, and thickness of the edge tip part is increased while the land width is surely formed in a short time, so that the cutting tool 2 by which vibration of an edge tip line in cutting raw wood can be prevented is provided.
NODA HIROYUKI
INAGAKI SHIGERU
