Hi Franco,
do you absolutely need to keep this workflow?
It works with something like this:
- create a face from the straight edge + projected edge
- make a revolution of it with 90 degrees around OZ
- cut the torus face
It works even without creating the face, but creating a revolution from the projected edge. Look at the different cuts in Study_cut.hdf (281,5 Ko).
Maybe there are issues with your original points and edges?
Christophe