| 摘要 |
PROBLEM TO BE SOLVED: To supply efficiently coolant to a cutting blade so as to ensure cooling and lubrication of the blade although an amount of protrusion of the cutting blade in a radial direction can be adjusted.SOLUTION: A shaft-like tool main body 1 that is rotated around a shaft line O is formed with a recessed place 2 that is opened to an outer peripheral surface of the tool main body 1 and recessed in a radial direction with respect to the shaft line O. In the recessed place 2, a cutting unit 11 equipped with a cutting blade 13 is installed so that an amount of protrusion of the cutting blade 13 in a radial direction of the tool main body 1 can be adjusted. In the tool main body 1, a coolant supply hole 4 extending in a direction of the shaft line O is formed, and the coolant supply hole 4 is communicated with a coolant spray hole 20 formed in the cutting unit 11 to supply coolant toward the cutting blade 13. |
