I'm trying to machine some small rectangular shaped pieces. They are a bronze alloy and are 1.370"L x .583"W x .500"H with a 9/64 radius. I'm using a Hyundai Kia VX-500 and a .500" 3 Flute Kennametal Endmill. My finish pass removes .030 at the full depth of .500" with 2 spring passes. I'm having trouble with the fitment of the radii of the parts. It's cutting the 1.370 and .583 to size correctly. If this makes sense, across diagonally of the part isn't the same. I'm measuring 1.407 across one side and 1.411 across the other side.
I've also had this issue with cutting an octagon. In gibbs cam everything is symmetrical and the machine is cutting a non symmetrical part that varies anywhere from .003 to .010.
Does anyone know what this could be caused by?