Sketch an ellipse, parabola, or hyperbola by defining start, end, and control points, and a rho value.
This functionality is currently available only on Onshape's browser platform.
In the Sketch toolbar:
- Click .
- Click to indicate a start point.
- Click to indicate an end point.
- Click to indicate a control point.
Enter a rho value.
For example, various rho values yield different shapes:
- Greater than 0.5 yields a hyperbola shape
- 0.5 yields a parabola shape
- Less than 0.5 yields an elliptical shape
To sketch a conic shape, first select the conic sketch tool from the toolbar. Click on the location of the first point in the conic, and then click on the location of the second point in the conic. You'll notice the rho dimension value box opens. Right now, at 0.5, this is a perfect parabola. Anything above 0.5 you can enter using your keyboard, for example, 0.75, click the enter key, and this creates a hyperbola. Anything below 0.5 in value creates a normal ellipse shape.
When you've entered the correct rho value, click the point once again to set it. This creates the conic shape.
You can also click and drag to create the conic shape and let go where you want the second point in the conic to be. Then click once again to create the rho value. Press enter on your keyboard, and your conic shape is created.