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Isometric Ellipse Lesson - page 4 
Further test the isometric ellipse by using the Transform Roll-Up to apply a 120 degree rotation to a duplicate. Align (Ctrl+A) that ellipse with the front face.
Finish the test of the isometric ellipse by using the Transform Roll-Up to apply a 120 degree rotation to a duplicate of the front ellipse. Align (Ctrl+A) that ellipse with the side face. Notice that everything fits and nothing looks bizarre.
The last step involves understanding how to place ellipses inside ellipses. To create an ellipse within an ellipse for objects such as a flat washer apply a 50% scale to a duplicate of the isometric ellipse. Then align them horizontally and vertically centered.
Duplicate (Ctrl+D) both ellipses move down and align them horizontally centered and vertical top. You now have the start of a conical washer facing up.
Duplicate (Ctrl+D) both ellipses again move down and align them horizontally centered and vertical bottom. You now have the start of a conical washer facing down or a counter sunk hole.

Conclusion
I know it took a while to get here but this ellipse is about as good as can be created on a computer. To summarize the commands: Circle (F7+Ctrl). Convert to Curves (Ctrl+Q) Add nodes (F10, marquee, Ctrl+F10 and +). Isometric Ellipse - Transform Roll-Up vertical scale 57.4%.

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