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金刚石钻进采用大螺距梯形螺纹的接头连接钻杆，为了密封循环水，梯形角度公差较严。由于螺距大，走刀速度快，螺纹轴向长度短，车螺纹比较困难。齿形的角度公差是靠车刀的刃磨精度和在刀架上的安装位置来保证的，因此，不易保证精度，生产效率也很低，工人劳动强度大。我们在普通车床上（如C6150，C620等）加装一个小铣头，使这一工作变得轻松容易，大幅度提高了效率和产品精度。所加附件不多，设计制造简单，还收到了一机多用的效果。
Diamond drilling using large pitch trapezoidal thread connector to connect the drill pipe, in order to seal circulating water, trapezoidal angle tolerance more stringent. Due to the large pitch, fast walking speed, axial length of the thread short, the car thread more difficult. Tolerance of tooth profile is based on the accuracy of the sharpening tool and the mounting position on the tool holder. Therefore, it is not easy to ensure the accuracy, the production efficiency is also very low, and the workers are labor-intensive. Our addition of a small milling head on a common lathe (such as the C6150, C620, etc.) makes this easy and effortless, dramatically improving efficiency and product accuracy. Add few attachments, design and manufacture simple, but also received a multi-purpose machine.