The Openbuilds dragknife toolpaths seem to be incorrect when I try a simple tests of geometric shapes. I use a homemade x-acto pen-knife mounted in bearings with a #11 blade. The point is 4.05mm offset from the axis of rotation. Here's a screenshot of the Openbuilds CAM toolpaths using the Dragknife-Cutout option: It doesn't cut right and you would think the rectangles and triangle should have toolpath corner swivels on every corner and the angled path on the bottom of the rectangles can't be right. I've tried making the offset negative, but that only moves that angled path above the rectangle bottoms. Thanks very much.
Thanks for the report. Drag knife is a tough piece of math, and may sometimes fail. Some alternatives you can try: Free cnc router software downloads for our Drag Knife
