Upon a better look at your file, and a quick load into Mach, it appears that you don't have corners in the code. They are indeed rounded. There is a possibility that you are not zoomed in close enough to actually see they are rounded in your cad program. Another thing that I notice is that your arcs are really only a huge amount of tiny lines. This is a common mistake made. You should do a bit of investigating and find out what you need to do in your software to output arcs. That particular part could have been made with less that 20 or so lines of code, and the motion from the machine would be soooo much smoother. Sorry for sending you off to read about something that wasn't your problem in the first place, however, it is a very informative piece that everybody should know about.