Currently the biggest issue I'm having in this planning phase of making a arduino powered CNC mill is finding a good (freeware/shareware) way of converting my CAD files to usable Gcode. From everything I have read the easiest way to do this is to first run a .obj file through a CAM software and then interpret that into Gcode. Does anyone know of a good way to do this, I use autodesk Inventor to do all my drawings? I also have access to solid works while on campus, but I'm pretty sure both programs can output all the same file types. Anyways thanks for the help and updates to follow as I make progress.