| OKUMA MULTUS U4000 2SC 1500 – CNC Multitasking Turning & Milling Center | |
|---|---|
| Manufacturer | Okuma |
| Model / Type | Multus U4000 2SC 1500 |
| Commissioning | 09/2017 (Okuma stock machine) |
| Control System | OSP P300S |
| Spindle Hours | Approx. 3,000 hours |
| Country of Origin | Japan |
| Condition | Good technical and visual condition. Produces precise workpieces and is ready for immediate operation. |
| Delivery Time | Short notice upon agreement |
| Machine Equipment | |
| • Enlarged main spindle KK size 11 – front bearing Ø 160 mm • Speed range: up to 3,000 rpm • Spindle bore Ø 112 mm • Main spindle motor power: 32 kW / torque 955 Nm • Hollow clamping cylinder Ø 127 mm – SMW VNK 320-127 • Pressure reducing valve (adjustment range 8–70 bar) • Tailstock • Turning length approx. 1,500 mm • H1 turret (1 station) • Y-axis • B-axis with positioning accuracy 0.001° • 40-station tool magazine • Lower turrets with 12 stations • Tool spindle 12,000 rpm • Hinged belt chip conveyor (self-cleaning, low maintenance) • Drum filter TMF300 with 980 l clean tank • Supply pump TC160/740 – 8 bar • Supply pump RSP 20/32-070-1-1-0 – 70 bar • Self-centering bezel on lower turret (not combinable with driven tools) • Door automation • Robot interface Type E • 3D machine model for CAM simulation |
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| Technical Data | |
| • Main drive (Okuma motor spindle): 22 kW / 700 Nm / 50–4,200 rpm • Spindle nose: KK size 8 – front bearing Ø 140 mm – spindle bore Ø 91 mm • Two-stage speed range with full-speed range switching • Lower turret: 12 stations – ZB axis with roller guide, XB axis with sliding guide • Real-time collision avoidance system (CAS) • 19″ color TFT LCD (1280×1024), touch screen, tiltable keyboard • Secondary operating system: Windows 7 (open system) • Programmable tailstock on W-axis with hydraulic quill • C-axis 360° – positioning accuracy 0.001° • Y-axis stroke: +150 / -150 mm (300 mm total) • B-axis travel: 240° – positioning accuracy 0.001° • Tool spindle: 22 kW / 120 Nm / 12,000 rpm • Internal coolant supply for rotating tools (max. 20 bar) • External tool spindle cooling (max. 3 bar) • Tool system: HSK-A63 • Tool monitoring for tool life and breakage • Tool measuring device (with standard chuck) • MacMan machine management system with integrated MES • Parts program memory: 2 GB (max. program size 2 MB) • Interfaces: 2 × USB 2.0, Ethernet, browser, DNC-T1 • Harmonic speed oscillation • Tool height correction in Y-axis for turning tools • Circular thread milling X/Z/Y/B (helical interpolation) • Eccentric milling X/Y/C • Hi-Cut Pro high-speed control • 10 selectable workpiece zero points • Coordinate transformation (translate / rotate) • Electrical spindle orientation ±0.1° |
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| Optional Services | |
| • Transport organization and execution • Machine installation and setup • Commissioning and handover ready for production |
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Technical Evaluation of the Okuma Multus U4000 2SC 1500
CNC Multi-Tasking Turning–Milling Center (Commissioned 09/2017)
1. Technical Evaluation Overview
The Okuma Multus U4000 2SC 1500 is a multi-tasking CNC turning–milling center commissioned in September 2017 as an Okuma stock machine. It is equipped with the OSP P300S control and is designed to combine turning, milling, and multi-axis machining within a single platform.
The machine features a main spindle with enlarged bearing configuration, a counter spindle, a B-axis milling spindle, Y-axis capability, and both upper and lower turrets, enabling complex complete machining operations. Reported spindle hours of approximately 3,000 indicate relatively moderate use for a machine of this class, though load intensity and duty cycle are not specified.
A 40-station tool magazine, additional 12-station lower turret, and extensive automation and software features position the machine for flexible, high-mix production environments. The stated turning length is approximately 1,500 mm.
2. What to Check Before Buying
Given the machine’s complexity, inspection should focus on spindle condition, axis accuracy, and kinematic integrity.
The main spindle (enlarged KK size configuration) should be checked for bearing noise, thermal stability, and torque delivery across its speed ranges. The counter spindle and programmable tailstock on the W-axis should be evaluated for alignment and clamping consistency, particularly on long workpieces.
The B-axis (240° travel, 0.001° positioning) and C-axis (360°, 0.001° positioning) should be tested for repeatability and clamping rigidity, as multi-axis accuracy is critical for combined turning and milling. The Y-axis stroke of ±150 mm (300 mm total) should be verified for smooth motion and geometric consistency.
Tool handling systems—including the 40-station tool magazine, HSK-A63 tool interface, and lower turret with 12 stations—should be tested for indexing accuracy and collision-free operation. The CAS real-time collision avoidance system and Hi-Cut Pro functionality should be verified in operation.
Auxiliary systems such as the hinged belt chip conveyor, drum filter TMF300, high-pressure and low-pressure coolant pumps, and door automation should be inspected under working conditions. Control-side checks should include software versions, backups, and network connectivity.
3. Typical Industrial Applications
Based strictly on the provided configuration, this machine is suitable for complete machining of complex rotational and prismatic components in a single setup. Typical applications include automotive, aerospace, energy, hydraulic, and general precision engineering components that require turning, milling, drilling, and multi-axis interpolation. The combination of B-axis milling, Y-axis turning, and counter spindle supports high-precision parts with reduced setup changes.
4. Common Risks in Used Machines
For used multi-tasking machines, common risks include wear in rotary and swivel axes, spindle bearing fatigue, and cumulative geometric deviations affecting multi-axis accuracy. Tool magazine complexity can introduce risks related to tool change reliability if maintenance has been inconsistent. Software-heavy systems may present risks if backups, option licenses, or configuration documentation are incomplete. Automation interfaces and door systems should also be checked for sensor or actuator wear.
5. Maintenance and Service Considerations
Maintenance requirements depend on actual operating conditions and service history, which are not detailed. Regular attention should be given to spindle lubrication and cooling, rotary axis clamping systems, tool changer mechanisms, and coolant filtration. The OSP P300S control, CAS, and MacMan/MES features require confirmed software support and backup procedures.
Long-term service planning should consider availability of Okuma spare parts and certified service support, particularly for spindle units, rotary axes, and automation components.
Final Note:
While the machine is described as being in good technical and visual condition with extensive equipment, critical information—such as axis accuracy measurements, maintenance records, and detailed spindle load history—is important. These elements should be verified through documentation review, geometry checks, and on-machine testing before forming final technical conclusions.
