extract an edge curve that was made from a conic curve gives a spline rather than a conic curve

[BEAEROHEAD]

In NX 7.5.5.4: When I extract an edge curve that was made from a conic curve or try to project it into a sketch it gives me a spline. I would like a conic curve. Any ideas or is it just the way it is. Can it be corrected in another version of NX.

 

[JohnRBaker]

I was able to Extract, AND Project into a Sketch, the edge of an extruded body that was created from a ellipse and the resulting curve, in both cases, was a Conic.

Can you provide at least a picture, if not the actual part file, showing what it is that you're attempting to do?

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Digital Factory
Cypress, CA
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To an Engineer, the glass is twice as big as it needs to be.

 

[Toost]

Its not a definitive truth that if the curve you use is a conic curve, that the resulting edge will be conic.
It depends on if the feature can do analytical shapes and if the circumstance allows an analytical shape or not. - Rather than the NX version.
If you use the Extrude body with a conic , the edge will most probably be a conic. But if you sweep a conic using the Swept Feature, the result will most probably be a spline or a tolerant curve since the swept feature is designed to interpolate "any shape".
NX is, in my perception, good at producing the simplest / cleanest type geometry( i.e Arcs, conics) when possible instead of using splines / B-surfaces everywhere.

Regards,
Tomas