CUTTING TOOL SHANK, CUTTING TOOL AND CUTTING WORK METHOD

To provide a cutting tool shank by which cutting work such as drilling and reaming can be performed with a common cutting tool regardless of whether a narrow part or not, while easily attaching/detaching the cutting tool to/from a hand-held tool rotating device.SOLUTION: A cutting tool shank 3 of cylindrical or columnar shape, for holding a cutting tool body 2 by means of a chuck of a tool rotating device has: a joint 5 portion for joining an end of the body; a holding portion 6 integrated with the joint portion and holding by means of the chuck. The holding portion has: a first attaching/detaching structure 7A formed at a first position P1 separated from an end face on a chuck side by a first distance D1 in a length direction of the shank, and used for attaching to/detaching from the first chuck; and a second attaching/detaching structure 7B formed at a second position P2 separated from the end face on the chuck side by a second distance D2 shorter than the first distance in the length direction of the shank, and used for attaching to/detaching from a second chuck that is shorter in length of insertion of the shank than the first chuck.SELECTED DRAWING: Figure 1 【課題】手持ち式の工具回転装置に切削工具を簡易に着脱できるようにしつつ、狭隘部であるか否かを問わず共通の切削工具で穿孔やリーマ加工等の切削加工を行える切削工具用シャンクを提供する。【解決手段】切削工具のボディ２を工具回転装置のチャックで保持するための円筒状又は円柱状の切削工具用のシャンク３であって、ボディの端部を接合するための接合５部と、接合部と一体化され、チャックで保持するための保持部６とを有し、保持部は、チャック側の端面からシャンクの長さ方向に第１の距離Ｄ１だけ離れた第１の位置Ｐ１に形成され、第１のチャックに着脱するための第１の着脱構造７Ａと、チャック側の端面からシャンクの長さ方向に第１の距離よりも短い第２の距離Ｄ２だけ離れた第２の位置Ｐ２に形成され、第１のチャックよりもシャンクを差し込む長さが短い第２のチャックに着脱するための第２の着脱構造７Ｂとを有する。【選択図】図１