Creo Elements/Direct Modeling generates an ellipse using a spline curve with a constant number of control points (36) for any size of ellipse. If required, you can manipulate the control points of the ellipse as with any spline.
Create an ellipse using the center and two peripheral points
With this method, you need to define the center of the ellipse and two points on the periphery of the ellipse.
1. Click Modeling and then, in the Draw group, click the arrow next to Spline.
2. Click Center & 2 Points in the Ellipse section.
3. Click a point in the workplane where you want the center of the ellipse.
4. Click a point on the periphery of the ellipse.
5. Click a second point on the periphery of the ellipse.
6. Click OK to complete the operation.
Create an ellipse using the center, an angle, and two radii
With this method, you need to define the following:
• Center of the ellipse
• Angle between the x-axis and the major axis of the ellipse
• Minor radius of the ellipse
• Major radius of the ellipse
1. Click Modeling and then, in the Draw group, click the arrow next to Spline.
2. Click Center, Angle & Radius in the Ellipse section.
3. Click a point in the workplane to define the center of the ellipse.
4. Type the angle value between the X-axis and the major axis of the ellipse and press ENTER.
5. Type the major radius of the ellipse and press ENTER.
6. Type the value for the minor radius of the ellipse and press ENTER.
7. Click OK to complete the operation.
Create an ellipse using two vertices and a peripheral point
1. Major radius
2. Vertex
3. Angle between X-axis and major axis of ellipse
4. Minor radius
5. Major axis
6. Center of ellipse
7. Minor axis
Creo Elements/Direct Modeling emulates an ellipse using a spline curve, so the foci of the ellipse are not used to generate the geometry.
With this method, you need to define two opposite vertices of the ellipse and a point on the periphery of the ellipse.
1. Click Modeling and then, in the Draw group, click the arrow next to Spline.
2. Click Axis & Point in the Ellipse section.
3. Click a point in the workplane to define a vertex of the ellipse.
4. Click the point at the opposite vertex of the ellipse.
5. Click a point on the periphery of the ellipse. Creo Elements/Direct Modeling generates the ellipse through the three points that you defined.
Spline.
Center & 2 Points in the Ellipse section.
to complete the operation.
Center, Angle & Radius in the Ellipse section.
Axis & Point in the Ellipse section.