ONA NX8

$280,000 - $420,000 Updated 2026-03-17

Key Specifications

X / Y / Z Travel

600 mm × 450 mm × 500 mm

Table Size (L × W)

900 mm × 600 mm

Max Workpiece Weight

1,000 kg

Max Electrode Weight

80 kg

Max Cutting Speed (Steel)

1,100 mm³/min

Best Surface Finish

Ra 0.2 µm

Overview

The ONA NX8 is a high-power sinker EDM built for demanding production environments that require maximum material removal rates on large, deep cavities in hardened tool steels and difficult alloys. As the most powerful machine in ONA's NX series, the NX8 delivers peak generator currents that enable aggressive roughing cycles on large forging dies, heavy-duty press tooling, and industrial mold bases where cycle time reduction is a primary economic driver.

The NX8's generator architecture is designed for sustained high-current operation without thermal drift, maintaining consistent discharge conditions across multi-hour roughing programs. The generator steps down cleanly to controlled finishing pulses for intermediate and final skim passes, providing a complete roughing-to-finishing solution in a single machine. Peak removal rates on P20 tool steel with graphite electrodes exceed 1,000 mm³/min, making the NX8 competitive with mid-range milling for stock removal on cavity forms that are better addressed with EDM.

The machine's structural design emphasizes rigidity and mass to absorb the forces generated during high-current discharge cycles. The Meehanite cast iron base, combined with hardened and ground box-way guideways, provides the structural foundation needed for accurate cavity positioning even under heavy electrode loads. A high-capacity dielectric unit with dual-pump flushing supports the machine's peak power levels and maintains consistent chip evacuation.

ONA's ONA-CNC expert system provides comprehensive control over complex cavity sequences, multi-cavity indexing, and automatic retract programs. The NX8 is frequently configured with ONA's automatic electrode magazine for production environments where multiple electrode sizes are required across a shift, and the machine integrates with pallet automation systems for connected factory applications.

Full Specifications

Parameter	Value
X / Y / Z Travel	600 mm × 450 mm × 500 mm
Table Size (L × W)	900 mm × 600 mm
Max Workpiece Weight	1,000 kg
Max Electrode Weight	80 kg
Max Cutting Speed (Steel)	1,100 mm³/min
Best Surface Finish	Ra 0.2 µm
Generator Peak Current	100 A
Electrode Materials	Graphite, copper, copper-tungsten
Dielectric	Hydrocarbon oil with dual-pump flushing
Positioning Accuracy	±0.003 mm
Guideway Type	Hardened and ground box ways
Control	ONA-CNC expert system

Strengths & Limitations

Strengths

100 A peak current and 1,100 mm³/min removal rate dramatically reduce roughing cycle times on large deep cavities
Dual-pump dielectric flushing maintains chip evacuation at sustained high-power operation
Massive cast iron structure and box-way guideways provide rigidity for accurate deep-cavity work
Full roughing-to-finishing capability in one machine eliminates workpiece transfers
Compatible with pallet automation and electrode magazine for connected production cell integration

Limitations

Very high capital cost limits the NX8 to shops with consistent large-format sinker EDM workloads
Large footprint and heavy base weight require reinforced flooring and overhead crane for installation
High-power operation requires robust electrical service and dielectric fire suppression infrastructure

Best For

Large forging and hot stamping dies with deep complex cavities in H13 and P20 tool steels Heavy-duty press tooling and blanking dies requiring high-speed stock removal on deep profiles Large automotive injection mold bases with multiple deep cavities in a single setup Production EDM cells integrated with pallet handling for high-volume die manufacturing

Frequently Asked Questions

01 How does the NX8 compare to the NX6 in ONA's lineup?

The NX8 offers a larger work envelope (600×450×500 mm vs. the NX6's smaller travel), higher peak current (100 A vs. 64 A on the NX6), and greater workpiece capacity (1,000 kg vs. 500 kg), making it the choice for the largest and most demanding sinker EDM applications.

02 What electrode material achieves the highest removal rate on the NX8?

Fine-grain isostatic graphite delivers the highest removal rates on the NX8 at 100 A peak current, with rates exceeding 1,100 mm³/min on P20 steel. Copper is reserved for finishing passes where Ra below 0.3 µm is required.

03 Can the NX8 perform precision finishing after high-power roughing in the same setup?

Yes. The ONA-CNC expert system manages the transition from high-current roughing to controlled finishing pulses automatically, executing a complete roughing-to-finishing sequence without operator intervention or workpiece repositioning.

04 What automation options are available for the NX8?

ONA offers electrode magazine changers for multi-electrode sequences, pallet change systems for workpiece automation, and integration packages for third-party robot loaders, enabling the NX8 to operate as part of a lights-out sinker EDM cell.

05 Does the NX8 require special floor preparation?

Yes. The NX8's mass and high-power operation typically require a reinforced concrete foundation with sufficient load-bearing capacity. ONA provides installation engineering specifications for site preparation prior to machine delivery.