FreeCAD: How to create a solid from a sketch by rotation extruding?

Create new document and switch workbench to Part Design workbench.

Select New Sketch in toolbar and select XY plane as sketch plane on the dialog. Click OK to create a new sketch plane.

Select Polyline in toolbar and draw a "H" shape on the sketch plane as shown in the following figure.

Select two end points and select Coincident constraint in toolbar to connnect the lines.

Select each segment of line and apply constraints as shown in following figure. In this operation, we use Horizonal constraint, Vertical constraint, Vertical Distance constraint, Horizontal Distance constraint, Equal Length constraint and other constraints.

Click Close on Task tab to exit sketch editing mode.

Select the created sketch model tree and execute Revolution to execute rotation extruding. Enter angle of rotation on the dialog and click OK.

Rotation axis can be selected from followings.

• Sketch plane's Horizonal axis
• Sketch plane's Vertical axis
• 3d coordinate-system's X axis
• 3d coordinate-system's Y axis
• 3d coordinate-system's Z axis
• Construction line in the sketch (select by click on 3D view)
• Edge of exisiting shape (select by click on 3D view)

Revolution operation results are as follows.