While working with families in the Family Editor, you can rotate a 2D shape around an axis to create a 3D revolve form.
This video demonstrates the following:
A revolve form is created by rotating a 2D shape around an axis in order to create a 3D form.
To create a revolve, select the Revolve tool. You are placed into sketch mode. To create the revolve, you need to define the boundary of the 2D shape that will be revolved, and you need to define the axis which the shape will be rotated around. Select which element you would like to create, and then select the drawing tool you will use to sketch.
In this case, the axis will be first created using the line tool, and then the closed-loop shape will be created for the boundary. Once complete, the revolve is finished, and the 3D form is created.
To make changes to the revolve form, select the revolve in the canvas, and click Edit Revolve. Changes can now be made to the boundary or axis sketch. With the revolve selected, the Start Angle and End Angle of the revolve can be adjusted and the material and visibility parameters of the revolve controlled.