Okuma LU4000 EX

$230,000 - $350,000 Updated 2026-03-13

Key Specifications

Max Spindle

3,500 RPM

Rapid Traverse

25/30

Spindle Power

30/22 kW (40/30 hp)

Max Turn Length

1,250

Accuracy

±0.005 mm

Repeatability

±0.003 mm

Overview

The Okuma LU4000 EX is a large-capacity twin-turret horizontal turning center that scales up the LU twin-turret concept for workpieces exceeding the LU3000 EX's range. With a maximum turning diameter of 500 mm (19.7 in) and two independent turrets, the LU4000 EX brings simultaneous OD and ID cutting capability to parts that require 12-inch or 15-inch chucks and high spindle power.

The main spindle delivers 30/22 kW (40/30 hp) at up to 3,500 RPM through an A2-11 spindle nose. Swing over bed is 710 mm (28 in), matching the single-turret LB4000 EX III. Standard turning length is 500 mm (19.7 in), with options extending to 1,500 mm (59.1 in) and 2,000 mm (78.7 in). Bar capacity is 104 mm (4.1 in) on the standard bore.

The upper turret carries 12 stations with BMT mounting for driven tools at up to 4,000 RPM. The lower turret adds 8-10 stations for OD turning, grooving, and cutoff operations. Simultaneous cutting from both turrets reduces cycle times by 25-40% compared to single-turret operation, which adds up significantly on parts with heavy stock removal and multiple operations.

At approximately 9,500 kg (20,944 lb), the LU4000 EX has the mass for vibration-free cutting during simultaneous operations. Box way construction on both axes provides the rigidity needed for aggressive cuts on large workpieces. Okuma's OSP-P300L control manages turret synchronization with Collision Avoidance System protection.

The LU4000 EX competes with large twin-turret lathes from Doosan (Puma TT 2500SY), Mazak (SLANT TURN NEXUS 550), and DMG Mori (NLX 3000/1250 with lower turret) in the large-capacity production turning segment. It's the right machine when large parts need multiple simultaneous OD/ID operations and cycle time is a primary concern. Specs sourced from Okuma published data.

Full Specifications

Parameter	Value
Max Turning Diameter	Ø480
Max Turning Length	1,250
Swing Over Bed	710 mm (28 in)
Max Spindle Speed	3,500 RPM
Spindle Motor Power	30/22 kW (40/30 hp)
Spindle Nose	A2-11
Chuck Size	12 in (305 mm) / 15 in (381 mm)
Bar Capacity	104 mm (4.1 in)
Upper Turret Stations	12 (BMT mounting)
Lower Turret Stations	8-10
Driven Tool Speed	4,000 RPM
Rapid Traverse Rate	25/30
Positioning Accuracy	±0.005 mm
Repeatability	±0.003 mm
Machine Weight	9,500 kg (20,944 lb)
CNC Control	Okuma OSP-P300L
Speed Range	42~4,200 [30~3,000]
Standard Power	22/15 [32/22]
Okuma Global Repair Center	Charlotte, North Carolina
Inches	Metric
Spindle Nose Type	A2-8 [A2-11]

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

Strengths & Limitations

Strengths

500 mm turning diameter with twin turrets combines large part capacity with simultaneous cutting productivity
30 kW (40 hp) spindle handles aggressive roughing on large steel, cast iron, and stainless workpieces
Twin turret operation saves 25-40% cycle time on parts with complex OD/ID operations
104 mm bar capacity covers large-diameter bar stock for heavy industrial production
9,500 kg mass with box ways provides exceptional stability during simultaneous cutting operations
Bed length options up to 2,000 mm handle long shaft work with tailstock support

Limitations

Starting at $230K, the twin-turret premium is substantial over a single-turret LB4000 EX III
3,500 RPM spindle speed limits high-speed finishing; this is primarily a roughing and mid-speed platform
At 9,500 kg, foundation and rigging requirements add significant installation costs
Programming twin-turret simultaneous operations requires specialized operator skills
Driven tool speed at 4,000 RPM on the upper turret is lower than smaller LU/LT series machines

Best For

Heavy industrial production shops turning large flanges, housings, and bearing carriers with complex OD/ID features Oil and gas manufacturers running large-bore pipe fittings and valve bodies at production volumes Power generation component shops needing simultaneous cutting on large turbine housings and generator parts Mining equipment manufacturers producing large hydraulic cylinder components Shops running single-turret LB4000 EX machines that need cycle time reductions to meet demand Large-diameter bar stock production for coupling and fitting manufacturers

Frequently Asked Questions

01 What does an Okuma LU4000 EX cost?

New LU4000 EX machines run $230,000-$350,000 depending on bed length and configuration. Standard bed configurations start around $230,000-$270,000. Long bed setups with full driven tool capability reach $310,000-$350,000. Used machines from 2013-2019 sell for $110,000-$180,000.

02 How does the LU4000 EX compare to the single-turret LB4000 EX III?

Both share the same basic spindle, swing, and turning diameter specs. The LU4000 EX adds a second turret for simultaneous cutting, providing 20+ tool stations and 25-40% cycle time reduction. The LB4000 EX III is simpler, cheaper by $60,000-$90,000, and easier to program. Choose the LU when production volume justifies the twin-turret investment.

03 Can both turrets do milling?

Milling capability with BMT driven tools is concentrated in the upper turret at up to 4,000 RPM. The lower turret is typically configured for static tools—OD turning, grooving, threading, and cutoff. This division of labor keeps the upper turret focused on complex operations while the lower turret handles straightforward turning simultaneously.

04 What parts justify the LU4000 EX over a single-turret machine?

Parts with heavy stock removal plus multiple OD and ID operations benefit most. Examples include pump housings requiring OD turning, ID boring, face grooving, and threading in one cycle. If both turrets stay engaged for more than 50% of the cycle, the investment typically pays back in 12-18 months of 3-shift production.

05 What foundation does the LU4000 EX require?

At 9,500 kg, the LU4000 EX needs a reinforced concrete foundation typically 300-450 mm thick with proper isolation. Rigging requires a 20-25 ton crane. Plan for foundation and rigging costs of $20,000-$35,000 beyond the machine price. Okuma provides detailed foundation drawings with each order.