Please have a look at the attached file. I've been beating my head against a wall for hours trying to get the undercut (Operation #9) to work properly. Depending on settings (I've tried many), either the tool doesn't fully cut the profile or it gouges. What am I doing wrong? The -Z portion of the profile (Operation #8, not undercut) works fine. MC2018 2.5 axis. Thanks!
Undercut_surface.mcam