I'm not sold on this explanation, but I did track some of my early trouble to a place where a '-' sign was dropped between the controller and interpreter. editor (Autodesk Fusion 360 Post Processor Editor), a JavaScript overview (the language of Autodesk post processors), in-depth coverage of the callback functions (onOpen, onSection, onLinear, etc.), and a lot more information useful for working with the Autodesk post processor system. For instance, G00 is a command for rapid movement. A G is followed by a number, which is a command to change geometry. And, even with complex CNC machining, G-code is written in a straightforward, logical way. I use the standalone controller, and the stepper motors are a great noise source. Simply put, G-code is a software programming language used to control a CNC machine. It's possible that the source of the trouble is not the interpreter making a mistake, but rather noise on the serial lines between the controller device and the interpreter. There are hundreds of thousands more lines of Gcode, but I get good parts instead of broken tools and messes to clean up! I've taken to using 'Arc Output' set to 'Convert to Lines'. One more adjustment which I put in place before what I've written above, I've also found that some hiccups can occur later in a run when there are lots of arc commands. A hiccup on a tiny machine is manageable, on a large machine it could make for a real mess. It would be nice to not have to do that, but it's manageable. The G1 button opens Sync Manager (only in Mill-Turn). So if I remove all of the comments at the top (example above), the code generally runs fine. If the machine file is missing or moved, Mastercam asks you to reassociate.

Mastercam v9 only posting g1 moves