Hi all.
A couple of years ago I built a large homemade CNC machine. It has served me well but one thing is not going as it should with it. I cant cut holes in the right shape. It has a quit heavy gauntry and Maybe that is the cause but think I need some help with this one.

Circles get jagged in one side and round and nice in the other side. The different shaped hole edges are in the long axis (X).

ANyone that can help me solve this? Using MACH3 and when milling wing cores with complex shape the result gets really nice. It is only when doing cutout files I get this. Maybe it is more information (points) when milling a wing foil???

Thanks in advance, Kayaken