Create and Modify the Arc

We begin by drawing the large circle, dividing it into two arcs, and deleting one of the arcs.

  1. Right-click the Plane 1 < XY(+Z) > heading under the Planes heading in the browser (tree view) and select Sketch.
  2. Click  Draw Draw Arc Center and Endpoints.
    • Press Enter to define the origin as the center of the arc.  Then...
    • Type  -20  in the "Y:" field and press Enter to specify the point (0, -20, 0) as the first endpoint of the arc.
    • Type  20  in the "Y:" field and press Enter to specify the point (0, 20, 0) as the second endpoint of the arc.
    • Click Apply.
    • Press Esc to exit the circle command.
  3. Click View Navigate Enclose (Fit All). The arc should appear as shown below.

    Note: This arc orientation is necessary if we are to mirror the resulting half-structure about the YZ plane. The structure we are building is shown in the half-model image below (with the arc just created highlighted). Note that the structure is symmetrical about the YZ plane.

  4. Click  Draw Draw Line.
    • Click one end of the arc, then click the opposite end of the arc. A padlock cursor appears when near an endpoint, indicating that the line will be snapped to the point.
    • Press Esc twice to exit the line command.
  5. Right-click the Plane 1 < XY(+Z) > heading under the Planes heading in the browser and deselect Sketch.

The model should display as shown in the following image.  

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