小螺距板牙丝锥主要几何尺寸的改进按《普通螺纹刀具》手册设计的丝锥在加工小螺距板牙时，常出现喇叭口和乱扣等现象，合格率只有４０％、通过在长期工作实践中对小螺距板牙丝雄的主要几何尺寸进行研究，笔者认为，产生喇叭口的主要原因是切削前角过大，切削锥部主偏角Ｋ... Small pitch Taps major improvements in geometric size Tap “ordinary thread cutter” manual design of the tap in the processing of small pitch teeth, often appear the bell mouth and chaos buckle and other phenomena, the pass rate of only 40%, through the long-term work on the small Pilothod thread male main geometric dimensions of the study, I believe that the main reason for the production of trumpet is cutting anterior horn is too large, cutting cone declination K ...