Question: How to draw an ellipse using CAD?

Why use rotation? CAD already has commands for drawing ellipses

It’s my fault for not explaining clearly; it’s an elliptical-shaped head

Draw an ellipse and then cut off half of it.

Use the ellipse command; however, first set it so that the pellipse command is used, changing the variable to 1 – the line drawn by the ellipse command will then be a polyline； 0 means a line.

1. First, draw two vertical axes for the ellipse. 2. Determine the endpoints of the ellipse’s axes (the endpoints are determined based on the length of the axis). 3. Enter the letters “el” on the keyboard and press Enter. 4. Use the mouse to click on one of the endpoints of one axis, then click on the other endpoint, and finally click on one of the endpoints of the other axis. 5. It’s done.

1. First, draw two perpendicular lines intersecting each other to serve as the center lines. 2. Determine the major axis D and the minor axis 2h of the ellipse; on the toolbar, click Draw/Ellipse/Arc to draw an ellipse with the intersection point of the two center lines as its center. 3. Use the shear command to retain the upper half of the ellipse above its horizontal center line. 4. Starting from each end of the ellipse’s major axis, draw two vertical lines downward; these will serve as the height of the straight sides of the ellipse’s cap. 5. Determine the thickness S of the cap. Use the offset command: select the ellipse and offset it outward by S. Then, offset the two lines that represent the height of the straight sides leftward and backward by S respectively. 6. Finally, draw a horizontal line to connect the two ends of the cap. That’s it.