11 May 2026
The Okuma Multus U4000 offers multitasking machining, with turning, milling, drilling, and even gear cutting converging. One machine, complete process integration, uncompromising precision.
If you’re exploring multitasking CNC technology and wondering whether the Okuma Multus U4000 lives up to its reputation, you’re in the right place. We’ll explain what makes these machines exceptional and how they transform manufacturing processes.
The Okuma Multus U4000 is an advanced multitasking machining centre, designed to consolidate lathe, vertical, and horizontal machining centre operations into a single machine. Within the wider Multus family, the U4000 stands out for its particularly impressive working envelope and its ability to handle large, complex components that would typically require multiple machines and setups.
This isn’t simply about saving floor space, although that’s certainly a benefit. It’s about fundamentally rethinking how complex components should be manufactured.
At the heart of the U4000 is Okuma’s B-axis head technology, which provides extensive rotational capabilities combined with powerful milling spindle options. The B-axis typically offers 225 to 240 degrees of rotation, allowing the cutting tool to approach workpieces from virtually any angle.
Combined with full C-axis functionality on the main spindle and optional sub-spindle configurations, the Multus U4000 delivers complete component manufacturing in a single setup. A lower turret further extends capability, enabling simultaneous operations and dramatically reducing cycle times.
The Multus range spans from the compact B200II, designed for 6- to 8-inch chuck work, through to the robust U5000. The U4000 sits at the capable heart of this range, offering the working envelope and multitasking versatility that make it the right choice for large, complex precision components.
Okuma’s thermally friendly concept addresses one of the fundamental challenges in precision machining: thermal deformation. Temperature fluctuations in the workshop environment or heat generated during cutting operations can cause dimensional drift, compromising accuracy.
The Multus U4000 incorporates structural design and thermal deformation control technology that delivers exceptional dimensional stability even during extended operation or environmental temperature changes.
This means components manufactured at the start of a lights-out shift maintain the same dimensional accuracy as those produced hours later, eliminating the need for constant dimensional compensation or time-consuming warm-up procedures.
For manufacturers operating 24/7 automated manufacturing, this thermal stability is transformative. You’re not adjusting offsets mid-run or scrapping parts because thermal drift pushed dimensions out of tolerance.
The Okuma OSP control system represents decades of refinement in machine tool controls. The latest OSP-P500 configuration features intuitive operation that seamlessly bridges the programming disciplines of traditional lathes and machining centres.
The collision avoidance system runs complete machining simulations, identifying potential crashes before they create scrap or damage tooling.
For complex multitasking operations where tool paths interact with rotating workpieces and multiple spindles, this software protection becomes essential rather than optional.
The Multus U4000 maintains the precision turning capabilities you’d expect from a dedicated lathe, whilst adding milling and further advanced functionality.
Main spindle speeds deliver robust torque for turning operations in challenging materials such as titanium and Inconel. The full-contouring C-axis enables off-centre drilling, milling of flats, and the creation of complex features whilst the workpiece remains in the main spindle.
This integration eliminates secondary operations that would traditionally require transferring parts to milling equipment.
One of the defining capabilities of the Multus U4000 is simultaneous 5-axis milling. The B-axis milling head transforms the machine from a capable lathe into a comprehensive machining centre, enabling simultaneous interpolation across all axes.
Milling spindle speeds range up to 20,000 RPM, with substantial power delivery enabling aggressive material removal when required. The 0.001-degree B-axis positioning accuracy, combined with compound-motion Y-axis capability, allows complex angles to be machined in a single pass, delivering a superior surface finish whilst maximising tool life.
This simultaneous 5-axis capability is particularly valuable for complex aerospace and defence components, where intricate geometries, compound angles, and tight tolerances must all be achieved in a single controlled setup.
The Multus U4000’s integrated second spindle enables complete machining of both ends of a component without manual intervention. The workpiece is passed directly from the main spindle to the second spindle, retaining the dimensional relationships established during first-operation machining throughout second-operation work.
For shaft-type components or parts requiring features on both faces, this eliminates the need to move the part across machines, as well as the errors that can be introduced.
The lower turret further extends the machine’s multitasking capability by enabling synchronised cutting operations on the workpiece. With both the upper B-axis head and the lower turret working in parallel, cycle times are significantly reduced without compromising accuracy.
Okuma’s proprietary turn-cut technology enables turning operations using the milling spindle rather than the main turning spindle.
The system simultaneously controls the circular motion of feed axes and spindle indexing angle, ensuring the tool edge always faces the rotation centre.
This capability allows you to machine diameters larger than the maximum tool diameter and to perform turning operations at compound angles. For components with angled bores or difficult-to-access turned features, turn-cut offers elegant solutions.
The Multus U4000 also features gear-cutting capability, setting it apart from conventional multitasking machines. This means complex components combining turned and milled features with integrated gear profiles can be produced in a single setup, a capability that previously required a dedicated gear-cutting machine as an additional process step.
For gearbox shafts, transmission components, and other parts where gear features are integral to the design, this capability eliminates an entire stage of the manufacturing process, reducing lead times and eliminating dimensional inconsistencies that can arise from re-fixturing between machines.
Aerospace manufacturing demands exceptional accuracy, comprehensive material traceability, and the capability to work with challenging alloys.
The Multus U4000 excels in this environment, delivering single-setup manufacturing of complex housings, structural components, and precision shafts.
When you’re machining titanium components with tolerance requirements below 0.01mm across multiple features, the U4000’s thermal stability, simultaneous 5-axis capability, and single-setup approach provide genuine advantages over traditional multi-machine approaches.
Defence components frequently combine demanding material specifications with complex geometries that include both turned and milled features, compound angles, and precise gear profiles.
The U4000’s breadth of capability means these parts can often be completed entirely on one machine, reducing the number of handling operations and supporting the traceability requirements common in defence supply chains.
High-performance automotive applications increasingly feature complex geometries combining turned diameters with milled features and integrated gear profiles.
Transmission shafts, differential housings, and engine components benefit enormously from the U4000’s multitasking and gear-cutting capabilities. The ability to turn, mill, drill, tap, and cut gears in a single setup compresses manufacturing timelines whilst improving dimensional consistency.
For medium-volume production, typical of performance automotive manufacturing, the U4000 delivers the flexibility to handle diverse component types without extensive retooling.
Hydraulic components, industrial automation parts, and precision gearbox elements all benefit from multitasking capability. These components typically combine turned bores with milled pockets, drilled features, and taped holes.
Completing them in a single Multus U4000 setup reduces lead times and improves consistency in quality.
The business case for Multus U4000 technology extends beyond technical capability to fundamental manufacturing economics. Setup time reduction delivers immediate productivity gains, particularly in medium-volume production where setup time accounts for a substantial portion of total cycle time.
Reduced handling improves quality and yields. When you eliminate transfers between machines, you eliminate opportunities for dimensional drift from repeated fixturing. The tolerances you programme are the tolerances you achieve.
Manufacturing flexibility is particularly valuable across a wide range of industries. A single Multus U4000 handles component types that would traditionally require separate lathes, machining centres, and gear cutting machines, reducing capital investment whilst improving floor space utilisation.
Our Okuma Multus U4000 is central to how we help customers manufacture complex components that combine turning, milling, and gear cutting operations. We’ve integrated this machine into our CNC machining capabilities because it delivers exactly what many of our customers need: complete components in a single setup with guaranteed dimensional relationships.
The U4000’s impressive working envelope makes it well-suited to larger, more complex components that push the boundaries of conventional multitasking machines.
With a maximum turning diameter of 650mm and a component length of 1,500mm, combined with its second spindle, lower turret, simultaneous 5-axis milling, and gear-cutting capability, it enables us to take on components that would previously have required multiple specialist machines and several setups.
Thermal stability means components machined at midnight meet the same tight tolerances as those produced during the day shift, which is especially important in industries like aerospace and defence, where precision is non-negotiable.
Our manufacturing engineers work with customers during design phases to optimise components for U4000 capabilities. This value-engineering collaboration often identifies small design modifications that unlock significant manufacturing efficiencies.
For example, incorporating gear features into a shaft component that might previously have required a separate gear-cutting operation. These changes reduce production costs whilst improving quality consistency.
Whether you need rapid-prototype quantities or high-volume production runs, our Multus U4000 capability enables us to machine complex shafts, housings, gearbox components, and structural parts in a single setup, delivering dimensional relationships and part-to-part consistency that would be extremely difficult to achieve across multiple machines.
The Okuma Multus U4000 represents where precision manufacturing continues to evolve: towards integrated processes that deliver complete, complex components (turned, milled, drilled, and gear-cut) without the quality risks and time penalties of multiple setups.
For those committed to excellence, efficiency, and manufacturing capability that supports rather than constrains design intent, multitasking machines like the Multus U4000 have become essential infrastructure rather than optional capability.
The shift from thinking in terms of separate turning, milling, and gear-cutting operations to truly integrated manufacturing processes requires both technological capability and manufacturing expertise. The Multus U4000 provides the technology.
The expertise comes from understanding how to leverage these capabilities effectively.
If the components you need could benefit from integrated turning, milling, and gear cutting capabilities, or if you’re looking to understand how the Okuma Multus U4000 could transform your manufacturing process, contact our team at R E Thompson.
We’re here to discuss your specific requirements and demonstrate how our capabilities deliver the quality, efficiency, and reliability your projects demand.
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20 Apr 2026
