Okuma LB3000 EXII

$120,000 - $220,000 Updated 2026-03-16

Key Specifications

Max Spindle

3,500 RPM

Spindle Taper

A2-8

Rapid Traverse

25/20 m/min (X/Z)

Spindle Power

18.5/15 kW (10 min/continuous) (25/20 hp)

Max Workpiece ⌀

Max Turn Length

Overview

The Okuma LB3000 EXII is a versatile 2-axis CNC turning center designed for medium-to-large diameter workpieces with 65 mm bar capacity and a 10-inch (254 mm) chuck. Part of Okuma's LB EXII series, the LB3000 EXII offers enhanced versions of capabilities from the previous LB EX generation, including improved thermal stability, higher spindle performance, and the latest OSP-P300L control with expanded intelligent functionality.

The turning spindle produces 18.5/15 kW of power at up to 3,500 RPM, providing strong torque for aggressive turning of steel, stainless steel, and cast iron. Maximum turning diameter of 413 mm and maximum turning length of 1,009 mm cover the broad range of shaft, flange, and sleeve components common in automotive, oil and gas, and general manufacturing. The 12-position turret with live tooling option enables prismatic milling, cross drilling, and off-center features without leaving the lathe — a significant productivity gain for components with both turning and milling content.

Okuma's Thermo-Friendly Concept is standard on the LB3000 EXII, maintaining thermal stability and positioning accuracy across shift changes without warmup programs. The OSP-P300L control includes Machining Navi L, Okuma's adaptive cutting force monitoring system for turning, which detects built-up edge, tool breakage, and chatter, reducing scrap and unplanned downtime. The Anti-Crash System provides protection for operator program errors during setup and production.

The LB3000 EXII competes with the Mazak Quick Turn 350, DMG Mori NLX 3000, and Doosan Puma 400 in the medium-large turning center class. New LB3000 EXII machines price between $120,000 and $220,000 depending on live tooling, sub-spindle, and other options. Specs sourced from Okuma Corporation published data.

Full Specifications

Parameter	Value
Max Turning Diameter	413 mm (16.3 in)
Max Turning Length	mm
Bar Capacity	65 mm (2.56 in)
Chuck Size	10 in (254 mm)
Max Spindle Speed	3,500 RPM
Spindle Motor Power	18.5/15 kW (10 min/continuous) (25/20 hp)
Spindle Taper	A2-8
Turret Stations	12-position
Live Tooling	Optional
Rapid Traverse Rate	25/20 m/min (X/Z)
CNC Control	Okuma OSP-P300L
Thermo Friendly Concept	Standard
Anti Crash System	Standard
Sub Spindle	Optional
Max Workpiece Diameter	mm
Speed Range	45~5,000
Rapid Traverse X Z	25/30
Standard Power	22/15
Okuma Global Repair Center	Charlotte, North Carolina
Inches	Metric
Max Machining Diameter	410
Max Machining Length	500 [1,000; 1,300]
Spindle Nose Type	JIS A2-6

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

Strengths & Limitations

Strengths

65 mm bar capacity with 10-inch chuck handles a wide range of medium-to-large shaft and flange workpieces in a single lathe platform
Live tooling option enables off-center drilling, cross-milling, and prismatic features without a separate machining center setup, reducing WIP and lead time
Thermo-Friendly Concept maintains dimensional accuracy across shifts without warmup programs, critical for consistent bore and diameter sizing in production
Machining Navi L adaptive monitoring detects tool breakage and cutting anomalies automatically, protecting expensive workpieces from scrap

Limitations

3,500 RPM maximum spindle speed is limiting for finishing small-diameter features or high-speed turning of aluminum compared to higher-speed alternatives
2-axis base configuration requires live tooling option for any milling work, adding cost; shops with significant mill-turn requirements should consider MULTUS or similar platforms
OSP control requires Okuma-specific post processors and operator training for shops transitioning from Fanuc or Siemens-controlled lathes

Best For

Automotive drivetrain component manufacturers turning large-diameter shafts, flanges, and hubs requiring consistent accuracy across high-volume production runs Oil and gas equipment shops machining valve bodies, coupling sleeves, and large-diameter fittings from stainless steel and alloy steel General manufacturing job shops needing a reliable, accurate large-chuck turning center for medium-volume production of diverse parts Shops running parts with secondary off-center features who want to add live tooling to reduce machining center setups without investing in a full mill-turn machine

Frequently Asked Questions

01 What bar sizes can the LB3000 EXII handle?

The LB3000 EXII accepts bar stock up to 65 mm (2.56 in) diameter through the spindle bore with the standard 10-inch chuck. For larger diameter bar or workpieces requiring a larger chuck, Okuma's LB4000 EXII with 12-inch chuck and larger bore is the appropriate step up in the LB series.

02 What is the difference between the LB3000 EXII and the earlier LB3000 EX?

The EXII generation introduces enhanced thermal management with Thermo-Friendly Concept II, improved spindle bearing design for better high-speed performance, the updated OSP-P300L control with Machining Navi L, and enhanced Anti-Crash System coverage. The EXII also incorporates structural refinements to the turret and tailstock for improved rigidity and repeatability compared to the original EX series.

03 Can the LB3000 EXII be fitted with a sub-spindle?

Yes, an optional sub-spindle is available for the LB3000 EXII for complete front and back turning of bar-fed parts in a single cycle. The sub-spindle accepts bar stock matching the main spindle capacity and includes its own chuck for part pickup. This is particularly valuable for production of complete turned components from bar without secondary operations.

04 How does Machining Navi L improve turning operations?

Machining Navi L monitors spindle motor current and vibration in real time to detect cutting anomalies including built-up edge formation, chatter onset, tool wear, and tool breakage. When anomalies are detected, the system alerts the operator or automatically adjusts feed rate to prevent scrap or machine damage. In lights-out operation, Machining Navi L reduces the risk of expensive scrap parts from undetected tool failures.

05 What is the maximum face-turning diameter on the LB3000 EXII?

The maximum swing over the bed is larger than the maximum turning diameter of 413 mm. Exact swing figures depend on turret and chuck configuration. For face-turning operations on large flanges and discs, the 10-inch chuck and 413 mm diameter capacity accommodate most medium-large flange workpieces. The LB4000 EXII provides additional diameter capacity for larger flange and disc work.