A retrofit is the refurbishing and updating of a machine to include a new CNC. The machine, in this case, a centerless grinder, may already have a CNC, but the control may be older and need updating so the machine can grind more precisely. Refurbishing replaces the machine’s components as needed, cleaning the machine, repainting and testing it. A retrofit can also include the addition of automation, a robot, for loading and unloading work pieces.