In the boring process of deep holes, the insufficient rigidity of the boringrod usually influences the machining accuracy.
在镗深孔加工中，常因镗杆刚度不足而影响加工精度。
2
Based on the research on micro movement and elastic gemels, a boring cutter micro compensation device amounted on the parallelogram elastic boringrod is developed with self owned intelligence right.
The axial flotation of chuck plays an important role in the protection of rod pipe threads and prevention of rod pipe stripping or cutterhead from dropping during the process of raise boring.