I have been trying to solve this issue for many months. I have a DIY cnc. I am using it to make guitars. It works quite well except for when it come to cut the contour shape of the guitar. It seems that when it's cutting straight lines it's fine. Curved shapes seem to produce a scalloped shape while making the curve.
I have included a pic of a problem curve as well as the g code for 1 pass around the contour.
I have tried so many settings in master cam and mach3 i can no longer count them. I have tried to reduce the gcode to use radius cutes instead of point to point. Perhaps i gone too far.