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为了提高结构钢和合金钢制零件上精密深孔的加工经济性与降低刀具的消耗,推荐使用单面切削的多刃钻头(苏联发明证书号3888350)。刀片2和4位于刀体1离钻头轴线不同的距离
In order to improve the processing economy of precision deep holes on structural steel and alloy steel parts and to reduce the tool consumption, single-sided cutting multi-blade drill bits (Soviet Invention Certificate No. 3888350) are recommended. Blades 2 and 4 are located at a different distance from the drill bit axis 1