Providing CNC Machining And Services In Cornwall Prime Engineering Cornwall Ltd is based in Lostwithiel Cornwall, incorporated in November 2018. The business is currently involved in the manufacture of quality machined components and parts in a variety of materials for engineering and the wider industry. Prime Engineering Cornwall Ltd carries out engineering processes which include CNC milling, CNC turning, surface grinding, centreless grinding, cylindrical grinding and bespoke tool grinding. Some fabrication is also carried out with mig and tig processes included.