1. First, open a partially drawn drawing with CAD software on the computer, and you can see that the drawing below lacks threads.
2. Then draw a diagonal of 45 and a diagonal of 120 respectively, as shown in the figure below.
3. Draw a line segment with a length of 26.944 upward from the center line. Here is the American 12# thread, and 26.944 is the major diameter of the thread, which can be drawn according to the actual thread size.
4. Then draw a straight line to the right from the midpoint of the 26.944 line segment.
5. Then trim and delete the redundant line segments according to the shape shown below.
6. Then draw a diagonal line with an angle of 60, as shown in the figure below.
7. Then extend the short line on the right to make it oblique to 60.
8. Then prune in CAD to achieve the effect shown below.
9. Then mirror the short line to form a V-shape.
10. Continue to mirror the V line segment composed of two short lines to the right until it is the same as the figure below.
1 1, execute the trim command again to delete unnecessary lines, and the thread will be half finished.
12, and then mirror the center line as the axis, as shown below.
13. Finally, stagger the V-shape with straight lines. After completing the above settings, you can draw screws and threads in cad software.