Okuma GENOS L400II

$110,000 - $180,000 Updated 2026-03-13

Key Specifications

Max Spindle

3,500 RPM

Rapid Traverse

20 m/min X, 25 m/min Z

Spindle Power

22/15 kW (30/20 hp)

Max Turn Length

500

Accuracy

±0.005 mm

Repeatability

±0.003 mm

Overview

The Okuma GENOS L400II is the largest machine in Okuma's GENOS turning center lineup, built for shops turning mid-to-large diameter parts that need more swing and power than the L250II or L3000-e can provide. With a maximum turning diameter of 400 mm (15.7 in) and a swing over bed of 630 mm (24.8 in), the L400II handles chucking work and shaft turning that smaller GENOS models can't touch.

The spindle delivers 22/15 kW (30/20 hp) at up to 3,500 RPM through a JIS A2-8 spindle nose. While the RPM ceiling is lower than the smaller GENOS models, the increased torque at the low end makes it better suited for heavy roughing in steel, cast iron, and stainless steel. The 10-inch hydraulic chuck and 76 mm (3 in) bar capacity match what you find on Okuma's premium LB3000 EX series.

Standard turning length is 500 mm (19.7 in), with options stretching to 1,000 mm (39.4 in) and 1,500 mm (59.1 in) for shaft work. The 12-station turret accepts both static and driven tools, and M, MY, and MYW configurations add milling, Y-axis, and sub-spindle capability respectively. Rapid traverse rates hit 20 m/min on X and 25 m/min on Z.

The OSP-P300LA control provides Thermo-Friendly Concept thermal compensation and optional Collision Avoidance System. At approximately 5,900 kg (13,007 lb), the L400II has the mass for vibration damping on heavy cuts. The box way construction ensures long-term geometric accuracy that shops notice when comparing it to linear guide competitors.

The GENOS L400II competes with the Haas ST-30, Doosan Puma 3100, and DMG Mori CLX 450 in the mid-size turning center segment. It bridges the gap between the value-oriented GENOS line and Okuma's premium LB4000 EX series. For shops that want Okuma quality and thermal stability without the premium LB-series price tag, the L400II delivers about 85% of the capability at roughly 75% of the cost. Specs sourced from Okuma published data.

Full Specifications

Parameter	Value
Max Turning Diameter	Ø330
Max Turning Length	500
Swing Over Bed	630 mm (24.8 in)
Max Spindle Speed	3,500 RPM
Spindle Motor Power	22/15 kW (30/20 hp)
Spindle Nose	JIS A2-8
Chuck Size	10 in (254 mm)
Bar Capacity	76 mm (3 in)
Turret Stations	12
X Axis Travel	215 mm (8.5 in)
Z Axis Travel	580 mm (22.8 in)
Rapid Traverse Rate	20 m/min X, 25 m/min Z
Positioning Accuracy	±0.005 mm
Repeatability	±0.003 mm
Machine Weight	5,900 kg (13,007 lb)
CNC Control	Okuma OSP-P300LA
Speed Range	30~3,000
Power 30 Min	11
Power Cont	7.5
Rapid Traverse X Z	20 / 30
Okuma Global Repair Center	Charlotte, North Carolina
Inches	Metric
Spindle Nose Type	JIS A2-8

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

Strengths & Limitations

Strengths

400 mm turning diameter and 630 mm swing handle mid-to-large parts that smaller GENOS models can't accommodate
22 kW spindle with high torque excels at heavy roughing in steel, cast iron, and stainless
76 mm bar capacity matches the premium LB3000 EX II, covering most production bar stock sizes
Available in L, M, MY, and MYW configs for scalable capability up to full mill-turn with sub-spindle
Thermo-Friendly Concept maintains tight tolerances across shifts without climate-controlled environments
Box way construction provides superior rigidity and vibration damping for heavy cuts
Multiple bed length options (500, 1,000, 1,500 mm) handle both short chucking and long shaft work

Limitations

3,500 RPM max spindle speed is lower than smaller GENOS models, limiting high-speed finishing on small diameters
At 5,900 kg, it requires more floor space and foundation considerations than compact lathes
Starting around $110K, it's significantly more expensive than a Haas ST-30 with comparable turning specs
OSP control has a smaller third-party ecosystem than Fanuc for operator training and post-processor support

Best For

Production shops turning parts in the 200-400 mm diameter range across multiple shifts Oil and gas component manufacturers needing heavy-duty roughing capability in tough materials Shops that want Okuma LB4000 EX capability at a more accessible price point Contract manufacturers handling a mix of chucking and shaft work needing flexible bed length options Facilities standardized on Okuma's OSP control platform across turning and milling operations Shops stepping up from 8-inch chuck lathes that need more swing and bar capacity

Frequently Asked Questions

01 What does an Okuma GENOS L400II cost?

New GENOS L400II machines run $110,000-$180,000 depending on configuration. Base L models start around $110,000-$125,000. MYW configurations with milling, Y-axis, and sub-spindle push into the $160,000-$180,000 range. Used machines from 2018-2023 sell for $70,000-$100,000.

02 How does the GENOS L400II compare to the Okuma LB4000 EX?

The LB4000 EX is Okuma's premium large turning center with higher rigidity, more spindle options, and a wider range of configurations. The GENOS L400II delivers about 85% of the LB4000 EX's capability at roughly 75% of the cost. For most production turning applications, the L400II is more than adequate. The LB4000 EX justifies its premium in demanding applications requiring maximum rigidity and precision.

03 Can the GENOS L400II handle long shaft work?

Yes. The 1,000 mm and 1,500 mm bed length options with tailstock support handle shaft turning up to about 59 inches between centers. For shaft work, spec the longer bed from the factory; converting after delivery is not practical.

04 What materials can the GENOS L400II handle?

The 22 kW spindle with box way rigidity handles steel, stainless steel, cast iron, Inconel, titanium, and other tough materials. The integral spindle motor delivers smooth power delivery for both heavy roughing and precision finishing. High-pressure coolant is recommended for exotic alloys.

05 Does the GENOS L400II support automation?

Yes. The machine supports bar feeders for bar stock production, gantry loaders for chucking work, and collaborative robot loading. Okuma's ARMROID integrated robot arm is also compatible with this platform. The MYW variant with sub-spindle enables complete part processing for true lights-out capability.