Method. Turn on the computer, start cad and prepare a picture. In this case, choose the slice in the following figure as an example. The first method is to copy and paste the picture into the cad workspace so that we can edit the picture. The second is to place the mouse on the insert column. Click "Attach Scan Imprint" in the drop-down menu to pop up the dialog box, select the picture you want to use, then click to open the second dialog box shown below, press the arrow to set it, and then confirm. You can see the picture entering the cad workspace. We use the spline command to draw a line on the picture, and finally the picture comes out.

The intersection of two revolving surfaces is called the intersection line, which is the solid * * * line of two surfaces, and the points on the intersection line are the solid * * * points of two surfaces. Generally speaking, the intersection line is closed. Spatial curve, but in special cases it is also a plane curve or a straight line. Solution method of intersecting line. Surface sampling method. When the projections of one surface of two rotating bodies are accumulated, these * * * points on the two solid surfaces can be made by taking points on the curved solid surface. This method is called surface sampling. Auxiliary plane method. Make a group of auxiliary planes, and find the intersection points of these auxiliary planes and the surfaces of these two rotating bodies respectively. These points are the points on the intersecting line. This method is called auxiliary plane method. For the convenience of drawing, the special position plane is generally selected as the auxiliary plane.