The angle to rotate a cutting bottle around a regular helix , for bottle at station n, is probably something like:

(#helix turns * 360) * n / (#stations-1)

assuming the initial bottle is at station index zero.

But since the helix may be of variable pitches, the angle would be some other unknown formula,
so perhaps a "normal to normal alignment" of the bottles vs the cylinder, would be better?

- Brian

The axis of the bottle, versus the surface of the cylinder is worrysome?

Burrman, thanks for link and info.