Post-processing should not work

The creation of a part program for a CNC machine tool which usually starts with a part drawing or model that contains the part material, geometry and tolerances is discussed. Geometry simulation software verifies that the final geometry is correct and there are no unintended collisions between the tool, holder, fixtures and workpiece. Each individual machine has its own piece of software, a 'post,' which takes the NC program created by the manufacturing engineer as input and produces the commands expected by the machine tool controller as output. The NC part program can be created based only on the geometry of the desired part and without a specific machine. NC programs should be written with a specific machine in focus. The engineer should select cutting conditions for that tool and machine that maximize machine productivity, while staying safely inside the stable zone.