在没有专用镗床的条件下,对于一些孔类加工,我们都是用铣床或车床镗制的。由于操作麻烦,又靠手对刀,精度很难达到要求。在这种情况下,工人田忠印等同志共同研究,制成了万能可调镗头。实践证明,这种工具,效果很好。它不仅适于各种类型孔的加工,同时对一些环形沟槽,孔端平面等也可加工。 In the absence of special boring machine conditions, for some hole processing, we are using a milling machine or lathe boring. Due to the troublesome operation, it is difficult for the accuracy to meet the requirements because of the hand-knives. Under such circumstances, workers Tian Zhongyin and other comrades studied together and made a universal adjustable boring head. Practice has proved that this tool works well. It is not only suitable for the processing of various types of holes, but also for some annular groove, hole end plane can also be processed.