ONA PRO-S

$180,000 - $280,000 Updated 2026-03-17

Key Specifications

X / Y / Z Travel

450 mm × 350 mm × 400 mm

Table Size (L × W)

700 mm × 450 mm

Max Workpiece Weight

500 kg

Max Electrode Weight

50 kg

Max Cutting Speed (Steel)

700 mm³/min

Best Surface Finish

Ra 0.1 µm

Overview

The ONA PRO-S is a high-precision die-sinking EDM positioned at the upper end of ONA's sinker lineup, built for manufacturers who demand both fine surface finish quality and high material removal rates within the same machine. The PRO-S is designed for complex precision mold and die production where the combination of fast roughing, controlled semi-finishing, and mirror-quality final passes is required without re-clamping or machine changes.

At the core of the PRO-S is ONA's advanced digital generator with multi-channel pulse technology that optimizes discharge energy for each phase of the machining cycle. The generator delivers peak currents sufficient for aggressive roughing while scaling down precisely to micro-pulse levels for final finishing, achieving Ra values below 0.2 µm in mirror-finish configuration. This range of capability within a single generator eliminates the need for manual parameter intervention during complex multi-pass programs.

The machine's C-frame structure is machined from Meehanite cast iron for thermal and mechanical stability, and all guideways are hardened and ground for long-term accuracy retention. A thermal compensation system monitors machine temperature and applies real-time corrections, ensuring dimensional consistency across extended production shifts. The work tank supports workpieces up to 500 kg, covering the majority of precision mold base sizes used in automotive and consumer electronics toolmaking.

ONA's ONA-CNC control includes an expert system for electrode orbit programming, graphical cavity sequencing, and automatic retract on power failure. The integrated technology database covers hundreds of electrode/workpiece/dielectric combinations, and the optional automatic electrode changer expands the PRO-S into a fully automated cell capable of executing complex multi-electrode jobs without operator intervention.

Full Specifications

Parameter	Value
X / Y / Z Travel	450 mm × 350 mm × 400 mm
Table Size (L × W)	700 mm × 450 mm
Max Workpiece Weight	500 kg
Max Electrode Weight	50 kg
Max Cutting Speed (Steel)	700 mm³/min
Best Surface Finish	Ra 0.1 µm
Generator Peak Current	64 A
Electrode Materials	Graphite, copper, copper-tungsten
Dielectric	Hydrocarbon oil
Positioning Accuracy	±0.002 mm
Thermal Compensation	Active real-time
Control	ONA-CNC expert system
Manufacturer	ONA
Model	PD 4.60 E0

Specifications sourced from machinio.com — verified 2026-03-28

Strengths & Limitations

Strengths

Multi-channel pulse generator handles rough-to-mirror finishing in a single setup without manual intervention
Ra 0.1 µm mirror finish capability reduces polishing labor on precision mold tooling
Meehanite cast iron construction with active thermal compensation ensures consistent long-run accuracy
500 kg workpiece capacity covers the majority of automotive and electronics mold base sizes
Optional automatic electrode changer enables full automation of complex multi-electrode sequences

Limitations

Premium pricing versus entry-level sinker EDM requires high-complexity, high-value workload to justify
Hydrocarbon dielectric system demands proper fire suppression and ventilation infrastructure
Larger footprint requires dedicated floor space allocation in the toolroom

Best For

High-complexity automotive plastic injection mold cavities requiring mirror-quality surfaces Consumer electronics tooling where cosmetic mold surfaces eliminate polishing steps Precision die casting dies and forging dies with deep complex cavities Automated production cells using multi-electrode sequences for overnight unmanned operation

Frequently Asked Questions

01 What makes the PRO-S different from ONA's AF series machines?

The PRO-S targets the high-precision mold and die segment with its mirror-finish capability and advanced multi-channel pulse generator. The AF series is ONA's production-oriented sinker line focused on throughput, while the PRO-S prioritizes surface quality and accuracy for high-value tooling.

02 What electrode materials are recommended for mirror finish on the PRO-S?

Copper electrodes produce the finest surface finishes on the PRO-S, achieving Ra 0.1 µm or better on steel. Graphite is preferred for faster roughing where the final finish target is Ra 0.4 µm or coarser.

03 Can the PRO-S handle carbide workpieces?

Yes. The PRO-S generator is designed for hard materials including tungsten carbide. Copper-tungsten electrodes are recommended for carbide work to minimize electrode wear.

04 Is an automatic electrode changer available for the PRO-S?

Yes. ONA offers an optional ATC (automatic tool changer) for the PRO-S that integrates with the ONA-CNC expert system to execute multi-electrode sequences automatically, enabling overnight unmanned production.

05 What dielectric fluid does the PRO-S use?

The PRO-S uses hydrocarbon EDM oil, which provides optimal surface finish quality for fine sinker work. The integrated dielectric unit includes filtration, temperature control, and level monitoring.