Helical Loader Help

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We want to build a helical loader. Unfortunately we tried different ways (on a prototype) but failed to get a satisfying result on how we would build the helical loader.

We seem to be having trouble getting the exact cuts and measurements for the surface of a helical loader.

Knowing us, it was obviously human error.

So how would YOU go about building a nice, simple, and structurally stable helix for the orbit balls to move through? We've already got the angle we want.

Any help would be appreciated much.

P.S. We'd like to go through many other methods, but Chief Delphi is the best resource you have in experience and which methods work best.

Thank You!