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 is equipped with a first shaft 21A having a plurality of first holes 36 having openings on an outer peripheral surface 26, and a tooth part 40 having teeth 43 formed in a screw shape and a plurality of second holes 41 that can discharge fluid passing through the plurality of first holes 36 toward the teeth 43, which is fitted to the first shaft 21A. The tool can be used while fitting the tooth part 40 to a second shaft 21B that is different from the first shaft 21A. In the first shaft 21A, the plurality of first holes 36 is provided in a first region 110 in an axis direction of the first shaft 21A. The first region 110 is different from a second region 120 in an axis direction of the second shaft 21B in which the plurality of first holes 36 having openings on the outer peripheral surface 26 is provided.SELECTED DRAWING: Figure 2 【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】工具は、外周面２６に開口を有する複数の第１孔３６を有する第１シャフト２１Ａと、ねじ形状をなす歯４３と、複数の第１孔３６を通過する流体を歯４３に向けて吐出可能な複数の第２孔４１とを有し、第１シャフト２１Ａに嵌められる歯部４０とを備える。工具は、第１シャフト２１Ａと異なる第２シャフト２１Ｂに歯部４０を嵌めて用いることが可能である。第１シャフト２１Ａには、第１シャフト２１Ａの軸方向の第１領域１１０に複数の第１孔３６が設けられる。第１領域１１０は、外周面２６に開口を有する複数の第１孔３６が設けられている第２シャフト２１Ｂの軸方向の第２領域１２０と異なる。【選択図】図２