Ramp around a cylinder (spiral, helix)

Hey all, first post here. I am having some trouble generating a curve around a cylinder. I was able to do it in a very sloppy way, but now that I have my inside and outside rails, I cannot seem to loft, sweep or patch them together to make a surface. Basically, I am trying to make a ramp surface based on geometry (in this case, a cylinder) which I can eventually precisely control the rise.

I am referencing the curves I have selected in the screen shot below (green).

1. Does anyone know a better way to make the curve up the cylinder based on a rise/run ratio. I know there's a better way...

2. What am I doing wrong in creating the surface between the lines I have generated? I have tried flipping and rebuilding the curves, lofting segments... arggg

Suggestions are much appreciated. Thanks!

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Permalink Reply by JS on January 14, 2014 at 6:35pm

Hi todd

Try the edge surface component. I'm attaching the definition.

EDIT: Whoops I forgot to internalize the stuff. Anyway, the curves I used was the line at the top, the line at the bottom and the two curvy lines.

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RAMPTESTCYLINDRICAL.gh, 19 KB

Permalink Reply by JS on January 14, 2014 at 7:51pm

There are better ways to get your curve. See this definition I made. You need Anemone for it to run.

Also I'm still new so I don't know what units grasshopper uses. Is it inches? Feet!? Anyway you'll have to fiddle with that yourself if you want it precise.

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