Mitsubishi Electric EA28V

VS-II incorporates a higher-speed gap monitoring system that samples gap voltage at a faster rate than the base VS system. This allows earlier detection of arc precursors and more precise parameter adjustment before arcing occurs. The result is stable cutting at higher power settings, enabling higher material removal rates without sacrificing surface quality. VS-II also includes refined finishing mode algorithms that achieve Ra 0.1 µm more reliably than the EA12V's VS system.

Mitsubishi's Fuzzy Logic adaptive orbit automatically adjusts orbit diameter, pattern, and speed during cavity finishing based on real-time gap condition monitoring. Traditional fixed orbit programs require the operator to manually select orbit parameters and test multiple settings to achieve the desired cavity size and surface finish. Fuzzy Logic eliminates most of this trial-and-error by dynamically adapting the orbit to maintain optimal gap conditions, producing more consistent cavity geometry and surface finish with less operator input.

Yes. The EA28V handles titanium, Inconel, Waspaloy, and other aerospace superalloys with appropriate generator settings and oil dielectric. Oil dielectric is generally preferred over water for titanium EDM to reduce hydrogen embrittlement risk at the eroded surface. Mitsubishi's V500 condition database includes aerospace alloy parameters. Cutting speeds are lower than on steel, but sinker EDM is often the only feasible process for complex geometry in hardened superalloys.

A typical production mold cavity program on the EA28V might use three to five electrodes per cavity — roughing, semi-finish, and one to three finishing electrodes of progressively tighter geometry. With 16 AEC positions, the machine can hold complete electrode sets for three to five cavities simultaneously, enabling a multi-cavity overnight run that progresses through all cavities and stages automatically. For very complex cavities requiring more electrodes, the AEC magazine can be manually reloaded between program segments.

The Mitsubishi EA28V and GF Machining FORM series (Form 20/Form 200/Form 400) are comparable mid-to-large format production sinker EDMs targeting similar applications. GF's ISPG (Intelligent Spark Protection Generator) and the Mitsubishi VS-II system both provide advanced adaptive discharge control. The GF FORM series has a stronger European market presence, while Mitsubishi has deeper penetration in Japan and strong North American distribution through Mitsubishi EDM. Service availability and dealer proximity are often important factors in machine selection between these two brands.