Metal Machined Components – Plastic Machined Components. Specialists in CNC machining including all aspects of 3, 4 & 5axis Milling plus Twin spindle lathes, for Metal and advanced Plastic components, Elder Engineering (Herts) Ltd offers a comprehensive machine shop to manufacture components and parts to your exact requirements. Elder Engineering (Herts) Ltd is certificated to AS9100 rev D, BS EN ISO 9001:2015. Only approved material suppliers that comply with our own standards and procedures are used.