K-90型风钻是我矿目前掘进的一种主要工具。由于这种风钻冲击频率高,棘轮套(图1.2)会很快磨损,使风钻过早地报废。为了进行修复,在无专用设备的情况下,我们自制了一套插削内螺旋槽的工具(图3),只要把工具固定在插床立 K-90-type pneumatic drill mine is currently driving a major tool. Due to the high impact frequency of this drill, the ratchet sleeve (Figure 1.2) will wear out quickly, causing the drill to be scrapped prematurely. In order to repair, in the absence of special equipment, we made a set of internal spiral groove cutting tool (Figure 3), as long as the tool is fixed in the bed