1. Transmission principle When turning threads, in order to obtain accurate threads, the tool holder must be driven by a screw to feed the workpiece so that the tool moves a distance equal to the pitch for each week the workpiece is turned. 2.Thread turning tool and installation The assurance of the thread angle α depends on the sharpening and mounting of the thread turning tool. The requirements of thread turning tool sharpening are 1) The tip angle of the turning tool is equal to the tooth angle α of the axial profile of the thread. (2) The front angle γ0=0°. In order to improve the cutting conditions, a turning tool with positive front angle (γ0=5°～15°) can be used for rough turning. 5°～15°). The requirements of threaded turning tool installation. (1) The tool tip must be equal to the center of rotation of the workpiece. (2) The parallel line of the tool tip angle must be perpendicular to the workpiece axis. Therefore, to use the tool sample to the tool. 3. Machine tool adjustment and installation After the tool is installed, the machine tool should be adjusted, according to the size of the workpiece pitch, find the lathe sign, select the position of the feed box handle, disconnect the light bar feed mechanism, and change to the screw drive. Choose a lower spindle speed so as to cut smoothly and have sufficient time to retreat the tool. In order to make the tool move evenly and smoothly, the clearance of the cross slide guide and the clearance of the small tool holder fillet and nut must be adjusted. During the turning process, if there is a small loosening of the workpiece to the spindle, it will lead to the inaccuracy of the thread shape or pitch, so the workpiece must be clamped firmly. 4. Operation method The thread center diameter is ensured by controlling the total depth of cut for multiple tool feeds. When turning threads, the depth of cut should be small each time, and the total depth of cut can be roughly controlled by the center slide dial and measured with the help of a thread gauge based on the calculated thread working tooth height (working tooth height = 0.54 x the pitch of the workpiece in millimeters). There are three methods of turning triangular threads, namely, the straight-in method, the left-right cutting method and the oblique cutting method. (1) Straight-in method Using the middle slide plate, the two cutting edges and the tip of the tool are cut at the same time. This method is easy to operate, and the thread shape is clear and the error is small. It is suitable for processing threads with a pitch of less than 2mm and finishing turning of high-precision threads. (2) Left and right cutting method The left-right cutting method is characterized by making only one cutting edge of the turning tool participate in the cutting, and moving a small distance to the left and right with the small tool holder at the same time of each depth of cut into the tool. This repeated cutting several times, turning to the last 1 ~ 2 knife, still use the straight into the method, in order to ensure that the tooth shape is correct, the root of the tooth is clear. This method is suitable for processing threads with large pitch. (3) Oblique cutting method The small tool holder is turned at an angle so that the turning tool is fed in the direction parallel to the right side of the thread to be turned, so that basically only one of the two cutting edges of the turning tool is cutting. This method has less cutting force, better heat dissipation and chip removal, larger cutting amount and higher productivity. However, it is not easy to turn out a clear tooth shape, and the error of tooth shape is large. It is generally applicable to rough turning of large pitch threads.

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