| 摘要 |
A neck (14) having an outer diameter smaller than that of a cutting edge (11) for boring is interconnected to a shank (13). A cutting edge (113) for removing burrs is provided at the connecting portion between the cutting edge (11) for boring and the neck (14) at an angle of inclination of about 45 degrees relative to the center axis of rotation of the tool. While this cutting edge (113) for removing burrs turns on its own axis of rotation, this axis of rotation effects turning motion with eccentricity E relative to the center of a machining hole. Further, a cutting edge for chamfering the entrance of the hole is provided to a part of the cutting edge (11).
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