Creating and Placing the Ellipse

Create an ellipse to subtract from the horn. The ellipse is placed on the face of the horn.

Create an ellipse.

1. On the Construct tab, in the Create surface group, click the  Ellipse icon.
2. On the Create ellipse dialog, click the Workplane tab.

The workplane will be placed on the underside of the flare by snapping it to the surface of the flare.

3. Press Ctrl+Shift while moving the mouse cursor over the flare.
   Note: View the change in the Origin, U vector and V vector fields as the mouse cursor is moved. Special snapping points are indicated in blue.
4. Move the mouse cursor over the flare while holding down Ctrl+Shift until the local workplane is orientated as displayed in the image.

   
   

   

   
   

5. Move the cursor closer to an edge, then to the face centre.
6. Now move the mouse cursor to a different edge and return back to the face centre.
   Note: The history of where the mouse cursor was moved to the face centre, affects the orientation of the workplane.
7. On the Create ellipse dialog, click the Geometry tab and set the following dimensions:

   Dimension	Value
   Radius (U)	0.3
   Radius (V)	0.2

8. Click Create to create the ellipse and to close the dialog.