helical cog-wheel

I have a problem with 3D construction method to achieve a helical cog-wheel starting from polyline in 2d. I'm trying to achieve a spiral starting from intersection between cylinder
and inclined plane following ellipse achieved. I do extrude command but this command doesn't generate an involute profile.
What must I do?
Sorry for my english.
thanks.
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offset a copy of the 2d ployline in the z axis by the desired distance. then use a reference point on the first ployline and a refrence point (one cog over) and use the "rulesurf"
also ensure that "surftab1" and "surftab2" are set to at least 36
good luck!

cog-wheel
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