镗床、插床等机床上用的刀杆，其装刀孔均为方形或长方形。这类方形孔都有较高的尺寸精度、形状精度要求，此外还有较高的刀杆母线对称度，垂直度等位置精度要求。因此加工和测量都比较困难。过去，一般中小型机械制造厂加工刀杆方孔均是先在立式铣床或钻床上加工出圆孔或... Boring machines, sockets and other machine tools used in the arbor, the installation of knife holes are square or rectangular. These square holes have higher dimensional accuracy, shape accuracy requirements, in addition to a high degree of symmetry pole bar symmetry, verticality and other position accuracy requirements. Therefore, processing and measurement are more difficult. In the past, the general small and medium-sized machinery manufacturing factory square hole is the first cutter in the vertical milling machine or drill hole processing or ...