ONA Electroerosion RP Series

$400,000 - $650,000 Updated 2026-03-17

Key Specifications

X / Y / Z Travel

1,000 mm × 700 mm × 600 mm

Table Size (L × W)

1,400 mm × 900 mm

Max Workpiece Weight

3,000 kg

Max Electrode Weight

150 kg

Max Cutting Speed (Steel)

1,500 mm³/min

Best Surface Finish

Ra 0.2 µm

Overview

The ONA Electroerosion RP Series is a family of large-format sinker EDM machines engineered specifically for large-scale mold and die production, including automotive body press tools, large industrial injection molds, and heavy forging dies. The RP Series is distinguished by its extended travel axes, high-capacity work tank, and generator architecture optimized for sustained high-power material removal on oversized workpieces that exceed the capacity of standard sinker EDM machines.

RP Series machines are built on massive cast iron bases with wide box-way guideways that support both large workpiece loads and the reaction forces generated by high-current roughing operations. The reinforced Z-axis column handles heavy electrode assemblies, including multi-electrode fixtures used in automotive toolmaking where several cavities are machined simultaneously to reduce total job cycle time. A high-capacity dielectric filtration unit with dual-pump pressure and suction flushing maintains consistent chip evacuation under demanding operating conditions.

The generator on RP Series machines provides peak currents up to 120 A with adaptive arc detection that protects workpiece surfaces from damage during deep cavity roughing. Automatic transition from aggressive roughing to controlled semi-finishing and final mirror passes is managed by the ONA-CNC expert system, which monitors gap conditions and adjusts energy levels without operator input. This capability is essential in large-format work where setting up for separate roughing and finishing operations would require expensive workpiece repositioning.

RP Series machines are frequently configured as production cells with electrode magazine changers and pallet handling systems. The wide table and high crane hook clearance allow integration with overhead material handling, and the machine's industrial design accommodates the physical demands of heavy automotive toolroom environments.

Full Specifications

Parameter	Value
X / Y / Z Travel	1,000 mm × 700 mm × 600 mm
Table Size (L × W)	1,400 mm × 900 mm
Max Workpiece Weight	3,000 kg
Max Electrode Weight	150 kg
Max Cutting Speed (Steel)	1,500 mm³/min
Best Surface Finish	Ra 0.2 µm
Generator Peak Current	120 A
Electrode Materials	Graphite, copper, copper-tungsten
Dielectric	Hydrocarbon oil with dual-pump flushing
Positioning Accuracy	±0.005 mm
Crane Hook Clearance	Available (machine-dependent)
Control	ONA-CNC expert system

Strengths & Limitations

Strengths

1,000×700×600 mm travel and 3,000 kg capacity handles the largest automotive press tools and mold bases
120 A peak current enables aggressive roughing at 1,500 mm³/min on large deep cavities
Heavy box-way construction supports multi-electrode fixture assemblies common in automotive toolmaking
Dual-pump flushing system maintains chip evacuation under sustained high-power large-format operation
Pallet and electrode automation integration enables 24/7 operation in production toolroom cells

Limitations

Very high capital and installation costs limit the RP Series to large dedicated automotive or industrial toolrooms
Requires reinforced foundation, large electrical service, and overhead crane for machine installation and operation
Throughput advantage over smaller machines only realized when workloads consistently involve large-format tooling

Best For

Automotive body panel press tools and large blanking dies requiring large-format sinker EDM cavities Industrial-scale plastic injection molds for automotive bumpers, dashboards, and structural components Large hot forging dies for connecting rods, crankshafts, and heavy machinery forgings Production die manufacturing cells with 24/7 unmanned operation using electrode and pallet automation

Frequently Asked Questions

01 What types of workpieces is the RP Series designed for?

The RP Series targets large-scale tooling including automotive body press tools, large industrial injection molds, heavy forging dies, and any sinker EDM application where workpiece dimensions or weights exceed the capacity of standard sinker machines.

02 How does the RP Series handle simultaneous multi-cavity machining?

The large Z-axis capacity and high electrode weight limit of 150 kg allows the use of multi-electrode gang fixtures that machine several cavities simultaneously, reducing total cycle time on automotive tools with repeated cavity patterns.

03 What surface finish is achievable on the RP Series?

Despite its focus on high-power production work, the RP Series achieves Ra 0.2 µm in fine-finishing mode, which satisfies most mold and die finish requirements without hand polishing for non-cosmetic surfaces.

04 Can RP Series machines be integrated with pallet automation?

Yes. ONA designs the RP Series for integration with both ONA electrode changers and third-party pallet handling systems, enabling automated 24/7 production cell operation in high-volume die manufacturing facilities.

05 What installation requirements does the RP Series have?

RP Series machines require a reinforced concrete foundation, three-phase electrical service at appropriate amperage for 120 A peak generator current, adequate dielectric storage and filtration, and overhead crane access for workpiece and electrode loading.