Yeah, that nod is very impressive looking! I'm having trouble getting it to run though (so for now I can just marvel at its complexity). I have version v.1.0.rc3.2018.03.09 of node editor installed on MoI 3 Sept 18 2014. Do I need to be running a different version? I'm both new to node editor and haven't moved on to MoI 4 beta yet, I'll give that a try later today. I've been using Grasshopper over in Rhino instead of node editor, but NE seems much faster from the few experiments I've done, so I'm going to give it another look.

With this geometry one thing that is easy to overlook is that you want the following contact points for the rollers:



The easiest way to do this should be with two swept rectangles (representing swept cylinders), each representing one side/face of contact. I'm still going through the material you guys have shared and will let you know if I get the model to work on my end! Again, thank you all so much!

Hi FDP,
I have modified the method to achieve the helix's to loft.
In the youtube video the helix's where created by two radii and distance between them thus creating a conic helix. The method I have used produces a helix on the surface of the hour glass shape as shown in Photo. You will need to produce 2 Outer & 2 Inner hour glass shapes to create the Cam Roller Groove.
Cheers
Barry

Anti Backlash would seem to be of benefit.

It seems to me that the worm should be cut a little bit smaller than the space between two cams, and
then the left and right halves of the worm should be separated by (half) the space difference.
(Or equivalently, be cut with the separation initially.)

The center of the worm is not doing anything. Less than half of the worm is driving the cams at any time.
So performance is much reduced...

The geometry of the Double-Roller seems to not have these drawbacks...

- Brian