Common faults and solutions when turning threads Threads are formed on the surface of a cylindrical workpiece along a spiral line, with continuous protrusions and grooves of the same cross section. In the machinery industry, threaded parts are widely used. Machining threads by turning is a common machining method. On a horizontal lathe (such as CA6140), four standard threads can be turned: metric, inch, modulus, and diameter control. No matter which type of thread is turned, the lathe spindle and the tool must maintain a strict motion relationship: that is, each revolution of the spindle One revolution (that is, one revolution of the workpiece), the turning tool should move a lead (of the workpiece) evenly. Their kinematic relationship is ensured as follows: the main shaft rotates with the workpiece, and the motion of the main shaft is transmitted to the feed box via the hanging wheel; the feed box is transmitted to the lead screw after variable speed (mainly to obtain various pitches); The screw rod and the opening and closing nut on the slide box cooperate to drive the tool post to move in a straight line. In this way, the rotation of the workpiece and the movement of the tool are achieved by the spindle, thereby ensuring the strict movement relationship between the workpiece and the tool. . In the actual turning of the thread, due to various reasons, the movement from the spindle to the tool causes a problem in a certain link, which causes a failure in the turning of the thread and affects normal production. At this time, it should be resolved in time.