To fix the casting on a rotating spindle with the tool made out of round shape which is the main casting.
The casting is fixed with the tool on the platform with the rotation of the cutting force. The generally 4 or 5-axis can be made into any shape processed products
If the surface roughness or dimensional tolerances require more accurate or high hardness can’t be used CNC machining milling. The choice of grinding can be overcame and achieved 1um.