In the article,by the vector and the coordinate change,the design calculation of thegeometric angles of a small cutter fixed boring cutter shaft is expounded.
本文论述了固定式镗刀当小刀头轴线与镗杆轴线的夹角小于９０°时，刀孔上平面高于径向平面，在巳知镗刀工作时所需各几何角度时，小刀头上各几何角度的设计计算。
The occurrence of such a change was closely related to the Small Sword Society uprising.
近代上海的初期 ,移民以福建、广东人为主 ,但不久被江浙等地的移民所取代 ,这一变化的出现与小刀会起义有紧密关联。