p3ppi wrote:ok, I believed that with the elics was possible draw a twisted bar, but it isn't possible. i tried.
I'm to try your system if i can understand ho to use it
You keep writing "elics" ...do you mean "Helix", as in like a 3d spiral? There is a similar word, "Ellipse" which is like a squashed circle. Is this just a translation error?
Or do you mean something else?
I was thinking that in occ/FreeCAD a Helix is created by the C++ code placing a line on the diagonal of the surface of a cylinder (or cone for a tapered helix). to get a path like the grooves in you picture, it looks to me like you would need to do something similar but with a torus. That is lay a line diagonally on the surface of a torus or part of a torus. But I have no idea if FreeCAD/occ could be made to do such a thing.