CHMER ED90QA Sinker EDM

The CHMER ED90QA is a large-format CNC sinker EDM machine from CHMER, the Taichung, Taiwan-based manufacturer that has become one of the world's largest EDM producers by shipped volume since its founding in 1975. The ED90QA targets the upper end of CHMER's die-sinking lineup, providing a substantial work tank and high workpiece weight capacity for automotive die shops, large plastic injection mold makers, and industrial tooling facilities that require EDM capacity at a significantly lower price point than European and Japanese premium brands.

The ED90QA features a work tank of approximately 900x600mm with axis travel sufficient for large automotive die inserts, die casting molds, and structural aerospace tooling. The machine uses CHMER's latest-generation digital IGBT generator with adaptive spark control, which monitors arc gap conditions and modulates pulse parameters to maintain stable burning across varying cavity cross-sections. An automatic electrode changer (AEC) is available in multi-position configurations, enabling complex multi-electrode burn sequences to run unattended. The ED90QA's rigid cast iron structure and precision ballscrew drives maintain positioning accuracy within ±0.003mm across the full travel range.

CHMER's CNC control on the ED90QA features a modern graphical interface with integrated 3D electrode path simulation, allowing operators to verify complex orbital burning sequences before committing to first-article production. The control includes CHMER's technology parameter database for common graphite and copper electrode combinations with P20, H13, NAK80, and other common die steels. The machine is compatible with System 3R and Erowa tooling systems, enabling shops using pallet workholding to integrate the ED90QA into existing automation cell configurations.

The CHMER ED90QA is valued globally as a cost-effective large-format sinker EDM alternative to premium European and Japanese machines. For shops where EDM is a production bottleneck and additional capacity is required at controlled capital cost, the ED90QA delivers acceptable surface finish, reasonable positioning accuracy, and reliable production performance at a price 25–40% below comparable GF Machining, Makino, or Sodick machines of similar tank size.