Sketching an Egg

[wandererfan]

I made this sketch using Part primitives and DraftToSketch after I failed miserably with elliptical arcs in Sketcher.

egg1v02Sketch.png (10.89 KiB) Viewed 826 times

Any hints on how to do it with Sketcher?

From wikipedia: "The shape of an egg is approximated by the "long" half of a prolate spheroid (ellipse around major)
joined to a "short" half of a roughly spherical ellipsoid, or even a slightly oblate spheroid".

[chrisb]

How about these two ellipses?

Snip macro screenshot-ececf1.png (7.2 KiB) Viewed 821 times

[wandererfan]

How about these two ellipses?

Nice. Thank you. I get it now.

[chrisb]

The segments of an ellipse are a bit difficult to constrain, because one is tempted to create a coincidence constraint of the arc's endpoint and one of the axises. But thies results in redundant constraints. So you have to use the point-on-object instead.

[papyblaise]

till sketch001 all it's ok
why you don't do the rhight revolve , preaps you don't select the good axle

[Vincent B]

From wikipedia: "The shape of an egg is approximated by the "long" half of a prolate spheroid (ellipse around major)
joined to a "short" half of a roughly spherical ellipsoid, or even a slightly oblate spheroid".

and more here:
http://www.mathematische-basteleien.de/eggcurves.htm