| 摘要 |
PURPOSE:To reduce the time energy etc. by forming the body in an arc of a concentrical circle continued from the shank end face of the peripheral cylindrical surface, by installing at its foremost part a cutting edge, whose tip is oriented in the tangential direction of the body and whose width has greater figures than the thickness in the radial direction, and thereby accomplishing boring with machining of hole partially. CONSTITUTION:A shank part 11 is provided whose periphery and bore are cylindrical, and the body part 12 in the form of an arc of a concentrical circle is formed in such a way as protruding at one end face of the shank 11. A cutting edge 13, which is oriented in the tangential direction of the body 12 and whose width has greater figures than the thickness in the radial direction, is installed at the foremost part of the body 12. This shank 11 of the tool 1 is grasped by a holder 7, and the tool 1 is fed with respect to a work in relative rotation concentrical with it. The work is machined by said cutting edge 13 with circumferential grooves and penetrated, and thus boring is performed. This provides boring merely with machining of hole partially, that should reduce the time, labor and energy greatly. Also the splash will be less generated, and the cut off column from the center may be used for other purposes.
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