Mitsubishi Electric EA12PS

$150,000 - $220,000 Updated 2026-03-17

Key Specifications

X / Y / Z Travel

350 mm × 250 mm × 300 mm

Table Size (L × W)

550 mm × 350 mm

Max Workpiece Weight

300 kg

Max Electrode Weight

30 kg

Max Cutting Speed (Steel)

600 mm³/min

Best Surface Finish

Ra 0.1 µm

Overview

The Mitsubishi Electric EA12PS is a high-performance die-sinking EDM that incorporates Mitsubishi's PS (Pulse Selector) function — a technology that dynamically selects the optimal discharge pulse waveform for each machining condition. This adaptive capability significantly improves both machining speed and surface finish quality compared to conventional sinker EDM systems, making the EA12PS a top choice for precision mold and die production.

The PS function analyzes gap conditions in real time and selects from a library of pre-engineered pulse forms, transitioning seamlessly between roughing, semi-finishing, and finishing regimes without manual intervention. This reduces total cycle time per workpiece while delivering mirror-like surface finishes in the final skim passes. Operators report consistent Ra values well below 0.4 µm in fine finishing mode.

The machine is built on a rigid cast iron base with thermal compensation to maintain accuracy across extended production runs. The work tank is generously sized for a compact sinker class, accommodating mold bases and electrode assemblies typical of small to medium mold shops. The automatic electrode changer option supports multi-electrode sequences for complex cavity shapes, enabling lights-out operation.

Mitsubishi Electric's ADVANCE CNC controls the EA12PS with a graphical interface that simplifies electrode orbit programming, corner rounding compensation, and multi-cavity sequencing. The technology database contains thousands of pre-optimized electrode/workpiece/dielectric combinations, enabling rapid setup even for less experienced operators. The EA12PS suits precision toolrooms running complex stamping dies, plastic injection molds, and medical device tooling.

Full Specifications

Parameter	Value
X / Y / Z Travel	350 mm × 250 mm × 300 mm
Table Size (L × W)	550 mm × 350 mm
Max Workpiece Weight	300 kg
Max Electrode Weight	30 kg
Max Cutting Speed (Steel)	600 mm³/min
Best Surface Finish	Ra 0.1 µm
Electrode Materials	Graphite, copper, copper-tungsten
Dielectric	Hydrocarbon oil
Positioning Accuracy	±0.002 mm
Generator Peak Current	50 A
PS Function	Real-time pulse waveform selection
Control	Mitsubishi Electric ADVANCE CNC

Strengths & Limitations

Strengths

PS (Pulse Selector) function delivers superior surface finish and faster cycle times automatically
Mirror-finish capability (Ra 0.1 µm) reduces or eliminates post-process polishing
Comprehensive technology database with thousands of pre-optimized parameter sets
Rigid cast iron construction with thermal compensation for consistent long-run accuracy
Optional automatic electrode changer supports complex multi-electrode unattended cycles

Limitations

Higher investment cost than conventional sinker EDM at equivalent work envelope size
PS function optimization is most beneficial on complex cavities; simpler jobs see modest gains
Hydrocarbon dielectric requires proper ventilation and fire suppression infrastructure

Best For

Precision plastic injection mold cavities requiring mirror-finish surfaces Complex stamping and blanking dies with multiple cavities and tight corner radii Medical device tooling where surface integrity and geometric accuracy are paramount Lights-out mold shop production using the optional automatic electrode changer

Frequently Asked Questions

01 What does the PS (Pulse Selector) function actually do?

The PS function monitors the discharge gap in real time and selects the optimal pulse waveform from a pre-engineered library, automatically transitioning between roughing and finishing conditions to maximize material removal and surface quality simultaneously.

02 What surface finish can the EA12PS achieve?

The EA12PS can achieve Ra 0.1 µm in fine finishing mode with graphite or copper electrodes, producing near-mirror surfaces suitable for optical and medical mold tooling.

03 How does the EA12PS differ from the EA12V?

The EA12PS adds the Pulse Selector (PS) adaptive waveform function, which provides better surface finish quality and faster cycle times compared to the standard EA12V, which uses a conventional pulse generator.

04 Can the EA12PS run unattended overnight?

Yes. With the optional automatic electrode changer, the machine can execute multi-electrode sequences for complex cavities without operator intervention, making it well-suited for overnight and weekend unmanned production.

05 What electrode materials work best on the EA12PS?

Graphite is the most common choice for speed and machinability. Copper produces finer finishes with lower electrode wear. Copper-tungsten is preferred for very fine features and carbide workpieces.