Creating and Placing the Ellipse

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

  1. On the Construct tab, in the Create Surface group, click the  Ellipse icon.
  2. On the Create Ellipse dialog (Geometry tab), create an ellipse using the following dimensions:
    • Centre point (C): (0, 0, 0)
    • Radius (Ru): 0.3
    • Radius (Rv): 0.2
  3. On the Create Ellipse dialog, click the Workplane tab.
    1. On the Workplane tab, select Custom workplane.
    2. Under Origin, click on X field to make point-entry active (indicated by a yellow outline).
    3. Move the mouse cursor over the flare while holding down Ctrl+Shift until the local workplane is orientated as displayed in the image.

      Figure 1. The placement of the ellipse on the horn.
      Note: The history of from where the mouse cursor was moved to the face centre, affects the orientation of the workplane.
  4. Click Create to create the ellipse and to close the dialog.