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generating a helical surface

Question asked by Dave Savage on Jul 8, 2016
Latest reply on Jul 8, 2016 by Paul Salvador

I am trying to generate a helical surface, not like a screw thread but more like a spiral stair. The best approximation I have thus far was made using swept boss with a rectangle as the profile and a helix as the path. The problem I am having is that the surface curves toward the axis of the helix effectively creating a depression at the center. Does anyone know a better way to get a  helical surface that is flat along the radius?