To draw a two-point arc

1. Click the Arcs > Arc (two point) icon, or choose Arcs > Arc (two point) from the Keypoint curve toolbox.

   

2. Click the start point of the arc, or type a 3D coordinate to place the point exactly.

   If you click the endpoint of an existing keypoint curve, the new arc will attach itself to the end of that curve. Dragging the common endpoint will move both curves.

   

3. Click the end point of the arc, or type a 3D coordinate to place the point exactly.
   • Click the to add the point freely.
   • Click the to align the point horizontally to the first point.
   • Click the to align the point vertically to the first point.

     

4. Click the center point of the arc, or type the radius of the arc.

   As you drag the center point, the Arc (two point) tool displays the radius of the arc in current linear units.

To draw a keypoint circle

1. Click the Arcs > Circular arc icon, or choose Arcs > Circular arc from the Keypoint curve toolbox.
2. Click the center point of the arc, or type a 3D coordinate to place the point exactly.
3. Click a point that will lie on the arc, or type a 3D coordinate to place the point exactly.

   As you drag the circumference, the Circular arc tool displays the radius of the circle in current linear units.

Tips and notes

• Key arcs are exported as IGES entity 100 (circular arc).
• Key lines are exported as entity 110 (line).
• Composite curves are exported as entity 102 (composite curve).

Options

Degree

Specifies the degree of the curve. The values range from 2 to 7. The default is 6.

Spans

Specifies the number of spans in the curve. The values range from 1 to 14. The default is 1.

NoteThe sum of the degree and number of spans cannot exceed 16. When creating rational geometry, as set in Preferences > Construction Options, the Spans option is not available.