When the turning thread common faults and solutions of thread in the cylindrical workpiece surface, formed along the helical line, continuous protrusions and grooves with the same profile. In mechanical manufacturing, threaded parts widely used. Turning method processing thread is processing methods commonly used. In the horizontal lathe (such as CA6140) on the turning of metric and inch system, the modulus and size control of the four standard thread, no matter what kind of thread turning, exercise strict relation between the lathe spindle and the tool must be: a turn each spindle (i.e. workpiece turn), turning tool should be evenly a mobile (workpiece) lead distance. The relationship between them is that the movement of the spindle with the workpiece rotates, the movement of the spindle to the feed box hanging round; from the feed box by a transmission after (mainly in order to obtain a variety of pitch) is transmitted to the screw by the screw nut; and the slip board box is matched with the driven tool for a straight line moving, so moving the rotation of the workpiece and tool are achieved through the spindle drive, so as to ensure the strict movement between the workpiece and tool. In the actual turning thread, due to various reasons, caused by the spindle to the tool movement between problems at some point, produce failure caused by turning the screw thread, affect the normal production, it should be resolved timely.