Convert surface to a solid body

[Anonymous]

I designed this surface using the Equation Driven Curve app. However, I can not convert it from surface to a body. 

Can anyone please help me?

Obs.: I`m trying to design a globoid worm gear.

 

[laughingcreek · Accepted solution]

your stitch was failing b/c it didn't like the way you made that last loft.  Made a few adjustments.  boundary fill works on it now. 

[Anonymous]

Thank you!