结构特点：
1. 走刀行程大，提高了加工效率；
Big feeding distance, improve work efficiency.
2. 镗杆采用特种热处理方法，硬度高，刚性好，有效地保证了加工精度；
Hardened spindle, give high hardness and good rigidity.
Improve the working accuracy.
3. 传动结构采用无级调速，适用于不同孔径及材质的加工；
Stepless speed suitable for different hole and materials.
4. 配有专用量具，既方便快速加工，又保证了加工精度。
Special measuring gauge can improve working efficiency
and working accuracy.
