Kathy I ran into the same problem today. It turns out in the Fadal Operators book it says there is a maximum programmable arc radius of 399.9999! The I value for the g3 code was 544. something. way over the limit. The Fadal control compensates by feeding at a 45deg angle and then straight line. As it does in rapid moves. This causes the jagged moves. I'm looking for a solve either in MasterCam or my post.