Mitsubishi EA28V CNC Sinker EDM
Key Specifications
Table Travel
Maximum Workpiece
Maximum Workpiece Weight
Generator
Surface Finish
C-Axis Option
Overview
The Mitsubishi EA28V is a mid-size CNC sinker EDM from Mitsubishi Electric's Machine Tool Division, designed for precision mold making, die casting tooling, and medical device component manufacture. Mitsubishi Electric is one of the four major Japanese EDM manufacturers (along with Sodick, Makino, and Fanuc), and the EA28V reflects the company's servo technology heritage in its axis control system. The machine features a 300x200x200 mm work table and accepts workpieces up to 450 kg, suitable for medium-size mold blocks and complex die inserts. Mitsubishi's M800 controller (shared with its machining center line) provides CNC and EDM generator control in an integrated environment, enabling programmatic electrode management for multi-electrode cavity burns. The EA28V's digital EX generator provides spark control with high-frequency ignition capability for improved surface finish on steel and carbide workpieces. An integrated C-axis rotary table option enables helical electrode paths for helical gear and thread insert EDM production.
Full Specifications
| Parameter | Value |
|---|---|
| Table Travel | 300x200x200 mm (X/Y/Z) |
| Maximum Workpiece | 450x340x250 mm |
| Maximum Workpiece Weight | 450 kg |
| Generator | Mitsubishi EX digital generator |
| Surface Finish | Ra 0.2 micron (finishing conditions) |
| C-Axis Option | CNC rotary C-axis for helical burning |
| Electrode Changer | Optional auto electrode changer |
| Control | Mitsubishi M800 CNC |
| Dielectric | Kerosene or deionized water (workpiece dependent) |
| Power | 200V, 3-phase |
Strengths & Limitations
Strengths
- Mitsubishi's proven M800 control integrates EDM programming with familiar CNC environment
- EX digital generator provides fine surface finish control for mold surface quality
- C-axis option enables helical EDM for thread and gear feature production
- Competitive pricing within Japanese EDM segment
- Long Mitsubishi service history in North America and globally
Limitations
- 300x200mm travel limits workpiece size vs larger Sodick AG60L or GF Form P 600
- Ra 0.2 micron finish less fine than Sodick (Ra 0.1) or GF Machining (Ra 0.05) top-end machines
- Electrode changer is optional — not included in base machine
- Kerosene dielectric requires fire suppression system for safety compliance
Best For
Frequently Asked Questions
01
The EA28V is configured for either kerosene (petroleum-based dielectric, most common for fine surface finish on steel) or deionized water. Kerosene provides better surface finish; water dielectric is safer for fire risk management in large shops.
02
The C-axis rotary table rotates the workpiece (or electrode) during the burn, enabling helical EDM paths. This is used for producing helical gear inserts, thread EDM in hardened material, and complex compound geometry features.
03
The EA28V is competitively priced against Makino EDAF3 and Sodick AG35L. Sodick has a surface finish advantage with linear motors; Makino has a reputation for advanced adaptive generator technology. Mitsubishi offers familiar M800 control to shops already using Mitsubishi machining centers.
Videos
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Community Discussions
Owner experience and review — sinker EDM action : r/Machinists - RedditLearn me Sinker EDM : r/Machinists - RedditSome more sinker edm action! : r/Machinists - Redditsinker edm, trial by fire : r/Machinists - RedditMaking sinker help : r/Machinists - RedditAre EDMs more precise due to more precise m
Owner experience and review — Learn me Sinker EDM : r/Machinists - Reddit
Community discussion — Some more sinker edm action! : r/Machinists - Redditsinker edm, trial by fire : r/Machinists - RedditMaking sinker help : r/Machinists - RedditAre EDMs more precise due to more precise motion ... - RedditMachining - Reddit
Community discussion — sinker edm, trial by fire : r/Machinists - Reddit
Links to community discussions. Summaries are editorial — visit the original thread for full context.
