About Twin City EDM Twin City EDM is ISO 9001:2015 and ISO 13485:2016 certified in not just wire and sinker EDM, but in doing swiss turning and CNC milling. Our staff members are involved in a quality assurance (QA) program. We continually improve services such as twin turret CNC turning and 5-axis milling and 5-axis micro hole turning combined with EDM services and finishing operations that include laser marking, welding and passivate. Our manufacturing improvements have reduced production costs, reduced product life cycle, and reduced the time it takes to complete your CNC milling and turning projects.