TOOL

To provide a tool that can efficiently remove chips from around a processed portion of a work-piece, in processing the work-piece using the tool equipped with teeth formed in a screw-shape.SOLUTION: A tool 200 is equipped with a shaft part 211 having a third hole 221 extending in an axis direction through which air as fluid can pass, teeth 43 arranged on an outer periphery of the shaft part 211 and formed in a screw shape, and a plug 81 fitted into the third hole 221. The shaft part 211 is provided with a plurality of fourth holes 231 having openings on an outer peripheral surface 46 of the shaft part 211, which can discharge air flowing through the third hole 221 toward the teeth 43. The plug 81 blocks some of the plurality of fourth holes 231 in the axis direction of the shaft part 211.SELECTED DRAWING: Figure 16 【課題】ねじ形状をなす歯が備わった工具によるワーク加工において、ワークの加工部分の周辺から効率的に切屑を取り除くことが可能な工具、を提供する。【解決手段】工具２００は、流体としての空気が通過可能で軸方向に延びる第３孔２２１を有するシャフト部２１１と、シャフト部２１１の外周に設けられ、ねじ形状をなす歯４３と、第３孔２２１に嵌められるプラグ８１とを備える。シャフト部２１１には、第３孔２２１を流れてくる空気を歯４３に向けて吐出可能であり、シャフト部２１１の外周面４６に開口を有する複数の第４孔２３１が設けられる。プラグ８１は、シャフト部２１１の軸方向において複数の第４孔２３１のうちの一部を閉塞する。【選択図】図１６