ONA AX 350

$120,000 - $200,000 Updated 2026-03-17

Key Specifications

X Travel

350 mm

Y Travel

250 mm

Z Travel

300 mm

Table Size

550 mm × 400 mm

max workpiece weight

500 kg

generator amperage

64 A peak (P-SERIES digital generator)

Overview

The ONA AX 350 is a high-performance CNC sinker EDM machine from ONA Electroerosion, a Spanish manufacturer with over 70 years of dedicated experience in electrical discharge machining. The AX 350 sits in the mid-range of ONA's AX platform, targeting tool and die shops, precision mold makers, and aerospace subcontractors that require reliable deep-cavity erosion capability combined with fine surface finish performance. With X/Y/Z travels of 350 mm × 250 mm × 300 mm and a workpiece capacity of up to 500 kg, the AX 350 covers the majority of industrial mold and die applications without the footprint or cost of a large-format machine.

The AX 350 is powered by ONA's digital P-SERIES generator, which manages pulse energy on a microsecond basis to maintain stable arc gap conditions across varying electrode geometries and cavity depths. The adaptive control continuously monitors discharge characteristics and adjusts pulse width, frequency, and current to minimize electrode wear, reduce recast layer thickness, and sustain erosion efficiency during long unattended burn cycles. ONA's no-wear graphite erosion technology, available as a generator mode, enables roughing with graphite electrodes at near-zero electrode wear rates — a significant advantage in die shops where electrode inventory and re-machining time drive cost.

Surface finish quality is a primary competitive attribute of the AX platform. The AX 350 achieves Ra values of 0.2 µm and below in fine-finishing mode using multi-step orbiting strategies, making it suitable for optical mold surfaces, precision gauge tools, and medical device cavities that require mirror-quality finishes without hand benching. The machine's orbital head supports programmed 2D and 3D orbital paths that clean cavity walls uniformly, eliminate electrode shadow effects, and allow single-electrode roughing-to-finishing cycles that reduce electrode change frequency and setup time.

The ONA-CNC control on the AX 350 provides an intuitive operator interface with a comprehensive technology database covering steel, carbide, copper alloy, titanium, and specialty material combinations. ISO programming is supported alongside ONA's conversational programming environment, and full CAM system integration through standard post-processor interfaces is available. Network connectivity, remote diagnostics, and ONA's teleservice support system are standard features, enabling rapid response to process interruptions and reducing downtime in production environments.

For shops operating multiple EDM machines or evaluating a first sinker EDM investment, the ONA AX 350 offers a well-balanced combination of work envelope, generator sophistication, surface finish capability, and service accessibility. ONA's global service network, though smaller than Japanese competitors in some regions, provides responsive support through authorized distributors, and the machine's modular architecture simplifies field maintenance and component replacement.

Full Specifications

Parameter	Value
X-Axis Travel	350 mm
Y-Axis Travel	250 mm
Z-Axis Travel	300 mm
Table Size	550 mm × 400 mm
Max Workpiece Weight	500 kg
Generator Amperage	64 A peak (P-SERIES digital generator)
Surface Finish	Ra 0.2 µm (fine-finish mode)
Dielectric	Dielectric oil (standard), deionized water option
CNC Control	ONA-CNC with adaptive gap control
Machine Weight	Approx. 3,500 kg

Strengths & Limitations

Strengths

P-SERIES digital generator with adaptive gap control maintains stable erosion on complex cavity geometries
No-wear graphite erosion mode minimizes electrode consumption and re-machining costs
Ra 0.2 µm fine-finish capability suitable for optical mold and medical device cavities
3D orbital head enables single-electrode roughing-to-finishing cycles that reduce setup time
ONA-CNC technology database covers broad material range including titanium and carbide

Limitations

ONA service network density is lower than Mitsubishi Electric or Sodick in North America and some Asian markets
350 mm X-travel limits cavity size compared to larger AX or competitor large-format machines
Premium digital generator technology carries higher price than basic sinker EDM alternatives at similar work envelope

Best For

Tool and die shops eroding precision punch-and-die sets and forming dies in hardened steel Mold makers producing mid-size injection mold cavities and core inserts requiring Ra 0.2 µm or finer Aerospace subcontractors eroding complex cavity features in nickel alloys and titanium Medical device manufacturers requiring fine-finish sinker EDM on implant tooling and precision fixtures

Frequently Asked Questions

01 What is ONA's no-wear graphite erosion mode?

ONA's no-wear mode applies specific pulse waveforms optimized for graphite electrodes that reverse the normal polarity wear pattern, achieving near-zero electrode consumption during roughing phases. This reduces the number of electrodes required per job and eliminates the time and cost of re-machining worn electrodes mid-cycle.

02 What surface finish can the AX 350 achieve?

The AX 350 achieves Ra 0.2 µm or finer in multi-pass fine-finishing mode with appropriate electrode material (copper or fine-grain graphite) and orbiting strategies. This is sufficient for most optical mold surfaces and precision die applications without secondary hand benching.

03 Does the AX 350 support 3D orbital machining?

Yes. The AX 350's orbital head supports programmable 2D and 3D orbital paths. 3D orbiting is used to clean cavity walls uniformly, improve flushing in deep cavities, and achieve consistent surface finish on complex prismatic and contoured shapes without multiple electrode changes.

04 What electrode materials does the AX 350 work with?

The AX 350 is compatible with graphite, copper, copper-tungsten, and silver-tungsten electrodes. Graphite is preferred for most die and mold roughing work due to its machinability and low density. Copper electrodes are selected for applications requiring very low surface roughness on steel.

05 How does the AX 350 compare to the ONA TF300 sinker EDM?

The AX 350 targets precision mid-size cavity work with its advanced P-SERIES generator and orbital capabilities, while the TF300 is positioned as a high-throughput die-sinking machine for larger electrodes and higher current applications. The AX 350 is preferred when surface finish and accuracy are paramount; the TF300 when material removal rate drives the decision.