I am using VCarve Pro to machine 4 simple arcs to create one cycle of a perfect sine wave. I save the tool path using the Arcs post processor for WinCNC and then machine the path with my ShopSabre servo controlled router. In one of the arcs I get an imperfect bump that is consistent from part to part. I have tried fitting a spline to the arcs and machining that path but the bumps are then more pronounced. The only thing I have found to help is to export the g-code using the standard GCode post processor instead of the arcs version. It still isn't perfect however. I know this is within the capability of my machine to produce so can only suspect it is within the G code itself. If anyone can suggest how to fix it I would appreciate your expertise.