I have attached a screen shot, and the 3dm file, of a helical “thread cutter” wrapped around a cylinder; both are closed polysurfaces. I wanted to Boolean Split the cylinder with the helix, and so get a worm pinion for gearing.
It didn’t work. Seems both are ok polysurfaces, and there are no coplanar surfaces. The helix was made with a Sweep, and ends Capped.
So what’s wrong? Maybe I should I use an entirely different method to get my worm pinion?
Thx in advance.AM9999 Worm.3dm (684.5 KB)