1)rod boring,钻杆钻进2)rodless drilling,无钻杆钻进3)axial travel of the boring bar,钻杆进尺4)auger drilling,螺杆钻进5)hollow-rod drilling,空心钻杆钻进6)drill shaft,钻杆，钻柄
用法和例句
To indicate axial travel of the boring bar,the counting assembly is formed with two counting gears that mesh with two drive gears and a differential,and a special counter.