Spindle feeds and speeds are controlled by selector levers which engage the proper gears in the drillhead.
主轴的进能量和转速是通过选速杆使主轴箱中的适当齿轮相啮合而控制的。
2
This paper introduces the 'structure characteristics and rock fragment characteristics of single step drillhead with point pick.
介绍了单阶梯尖环齿钻头的结构特点及碎岩特点。
3
The drillhead for manually drilling has slow rotary speed and does not have temperature increase so that the occurrence of condition such as body tissues burn is avoided.