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Creating a spiraled horn in NX.

Hi all,

I'm kinda new here (by kinda i mean i just created an account). I have an issue I'm working on and I'm not sure how to even ask google the right question!

I am trying to make a spiraled/tapered horn: http://puu.sh/e2U0h/37ba8673b3.png

I've created 4 helixes, all the same dimension, each offset by 90 degrees.

The issue i have is I'm not sure how to go from these lines to a solid body. I thought maybe a sweep but i've had little luck. could someone offer me advice?