XU-600型钻机变速箱，其它零部件很耐用，就是卷扬机轴孔易损坏。为了节约修理费用和保证修理质量，我们革新制作了搪孔器。先后修复四台钻机变速箱，经两年使用证明，修复的箱孔同心度好，配合精度能保证。此搪孔器结构简单，容易制作，安装使用方便。 XU-600 rig gearbox, other parts are very durable, is the shaft hole of the winch is easy to damage. In order to save repair costs and ensure the quality of repairs, we have created a boring machine. Has repaired four rig gearboxes, after two years of use to prove that the repair of the hole concentricity is good, with the accuracy can guarantee. The boring device has a simple structure, is easy to manufacture, and is easy to install and use.