it looks to me like a program error with the endmill. are you milling the id and the od? when you dry run the program(does anyone but myself do this anymore?) are the machine positions corresponding to the print?
it looks like you are trying to pull an arc from more than 90° but less than 180 and the machine doesn't like it. or there might be a discrepeancy between the initial arc start point and the arc itself.what kind of machine is it? |