結構特點：
1.   走刀行程大，提高了加工效率；
     Big feeding distance, improve work efficiency.
2.  鏜桿采用特種熱處理方法，硬度高，剛性好，有效地保證了加工精度；
     Hardened spindle, give high hardness and good rigidity.
     Improve the working accuracy.
3.  傳動結構采用無級調速，適用于不同孔徑及材質的加工；
     Stepless speed suitable for different hole and materials.
4.  配有專用量具，既方便快速加工，又保證了加工精度。
     Special measuring gauge can improve working efficiency
     and working accuracy.