Secondly there is error between the thread roll angles of thread rolling die and drill rod.
滚丝轮螺纹和钻杆螺纹的螺旋角有误差。
The utility model relates to a medical orthopaedics left-hand drill bit for drilling a left-hand thread hole. A metal drill rod is carved with a left-hand groove.
本实用新型涉及一种可以钻左旋丝孔的骨科医用左旋钻头，它是在一个金 属钻杆上镂刻有左旋凹槽。
The utility model relates to a medical orthopaedics left-hand drill bit for drilling a left-hand thread hole. A metal drill rod is carved with a left-hand groove.
本实用新型涉及一种可以钻左旋丝孔的骨科医用左旋钻头，它是在一个金 属钻杆上镂刻有左旋凹槽。
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