... group of operators who are specilized in CNC turning parts. 1. Material: Carbon steel; Stainless steel, aluminum alloy; Brass alloy; Tinplate, copper; Stannum bronze ... ; Tungsten steel, etc. 2. Machining processes: Metal fabrication, machining, welding, forming, shaping, punching, drilling, turning, milling, grinding, chip formatting, rolling, stamping, deep ...