一、加工螺纹底孔应注意的事项(一)严格按照《机械工人切削手册》进行查表和计算,选择所需加工螺纹底孔的钻头或扩孔钻头。钻头的切削刃要锋利,刃带要光滑,不得有毛刺和磨损等,避免底孔刮伤或产生锥度 First, the processing thread bottom hole should pay attention to matters (A) in strict accordance with the “Manual of Machineries Cutting” look-up table and calculations, the choice of processing the bottom hole of the drill bit or reaming bit. The cutting edge of the drill should be sharp, the land should be smooth, there should be no burr and wear, etc., to avoid the bottom hole scratches or taper