Okuma MU-4000V
Key Specifications
Max Spindle
Spindle Taper
Tool Capacity
Spindle Power
Max Workpiece ⌀
table diameter
Overview
The Okuma MU-4000V is a compact 5-axis vertical machining center built around a dual-support trunnion table for simultaneous 5-axis machining of small-to-medium precision parts. With a 400 mm diameter table supporting workpieces up to 500 mm diameter and 400 mm height at a maximum load of 300 kg, the MU-4000V targets the sweet spot for aerospace fittings, medical implants, and precision automotive components.
The standard 15,000 RPM No. 40 spindle produces 22 kW (30 hp) at 10-minute rating and 18.5 kW (25 hp) continuous with 199 Nm of torque at 5-minute rating and 146 Nm continuous. An optional turning mode enables the C-axis table to rotate at up to 12,000 RPM with 15 kW turning power and 477 Nm of torque, allowing turn-mill operations in a single setup. The B-axis tilts from +90 to -120 degrees while the C-axis rotates 360 degrees continuously.
Rotary axis accuracy is exceptional: B-axis positioning accuracy of plus or minus 1.78 arc-seconds with 0.50 arc-second repeatability, and C-axis positioning accuracy of plus or minus 2.26 arc-seconds with 0.12 arc-second repeatability. Tool storage holds 32 tools. Machine dimensions are 2,399 x 3,248 x 2,950 mm, keeping the footprint compact. The MU-4000V runs on Okuma's OSP control with Thermo-Friendly Concept, Anti-Crash System, and Five-Tuning for 5-axis accuracy calibration.
The MU-4000V competes with the Mazak VARIAXIS C-600, DMG Mori DMU 50, Hermle C 22, and Makino D500 in the compact 5-axis segment. Okuma differentiates with the optional turning capability (up to 12,000 RPM table rotation) and the Five-Tuning calibration system that simplifies 5-axis accuracy verification. New MU-4000V machines price in the $300,000 to $450,000 range. Specs sourced from Okuma Corporation published data.
Full Specifications
| Parameter | Value |
|---|---|
| Table Diameter | ø400 mm (15.7 in) |
| Max Workpiece Diameter | ø500 mm (19.7 in) |
| Max Workpiece Height | 400 mm (15.7 in) |
| Max Table Load | 300 kg (661 lb) |
| B Axis Range | +90° to -120° |
| C Axis Rotation | 360° continuous |
| B Axis Speed | 50 min⁻¹ |
| C Axis Speed | 120 min⁻¹ (1,200 min⁻¹ turning mode optional) |
| B Axis Accuracy | ±1.78 arc-seconds positioning; ±0.50 arc-seconds repeatability |
| C Axis Accuracy | ±2.26 arc-seconds positioning; ±0.12 arc-seconds repeatability |
| Max Spindle Speed | 15,000 RPM (12,000 RPM in turning mode) |
| Spindle Taper | No. 40 (BT40) |
| Spindle Motor Power | 22/18.5 kW (10 min/continuous) (30/25 hp) |
| Spindle Torque | 199/146 Nm (5 min/continuous) |
| Turning Spindle Option | 12,000 RPM, 15/10 kW, 477/318 Nm |
| Tool Capacity | 32 tools |
| CNC Control | Okuma OSP-P500M |
| Machine Dimensions | 2,399 x 3,248 x 2,950 mm (94.4 x 127.9 x 116.1 in) (W x D x H) |
| Okuma Global Repair Center | Charlotte, North Carolina |
Specifications sourced from okuma.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Dual-support trunnion table provides rigidity for both milling and optional turning operations, outperforming single-support designs under heavy cutting loads
- Optional turning mode with 12,000 RPM C-axis rotation and 477 Nm torque enables true turn-mill multitasking in a 5-axis platform
- Sub-2-arc-second positioning accuracy on both rotary axes delivers the precision needed for aerospace and medical component machining
- Five-Tuning calibration system simplifies periodic 5-axis accuracy verification and correction without external service technicians
- Compact 2,399 x 3,248 mm footprint delivers full 5-axis capability without consuming excessive floor space
- Thermo-Friendly Concept maintains 5-axis accuracy across production runs where thermal effects on rotary axis geometry cause cumulative errors
Limitations
- 300 kg table load including fixtures limits this to small-to-medium parts — heavy workpieces require the larger MU-6300V or MU-8000V
- 32-tool magazine is limited for complex 5-axis work requiring many tool types — shops running diverse part mixes may need more capacity
- 15,000 RPM standard spindle speed is moderate for a 5-axis machine — competing machines offer 20,000-30,000 RPM for high-speed finishing
- 500 mm maximum workpiece diameter constrains part size for shops occasionally needing to machine larger components
Best For
Frequently Asked Questions
01
New MU-4000V machines typically price between $300,000 and $450,000 depending on turning spindle option, tool magazine size, and accessories. The turning mode option adds approximately $30,000-$50,000 to the base price. Used MU-4000V machines from 2015-2022 trade between $150,000 and $280,000 depending on hours and configuration.
02
The optional turning mode converts the C-axis table from an indexing/contouring axis to a high-speed turning spindle rotating at up to 12,000 RPM with 477 Nm of torque. This allows OD and ID turning, face turning, and boring operations on the same workpiece that was just milled — all in a single setup. The milling spindle holds turning tools for these operations. This is true turn-mill capability, not just indexing.
03
Five-Tuning is Okuma's proprietary 5-axis calibration system that measures and corrects geometric errors in the rotary axes using a simple ball-bar test routine. It identifies and compensates for pivot point errors, angular errors, and offset errors in the B and C axes. The process takes about 15 minutes and can be run by operators without external metrology support, making regular 5-axis accuracy verification practical.
04
Both are strong compact 5-axis machines. The MU-4000V offers optional turning capability and Okuma's single-source control integration. The DMU 50 offers a wider range of spindle speed options and slightly larger work envelope. The Okuma has better rotary axis accuracy specifications. The DMG Mori has a broader global service network. Both are excellent platforms for small-to-medium precision 5-axis work.
05
Yes. The dual-support trunnion table and 199 Nm spindle torque at 15,000 RPM provide adequate rigidity and cutting force for titanium at moderate depths of cut. For heavy titanium roughing, the 12,000 RPM turning mode with 477 Nm torque adds additional capability. The 300 kg table load and compact work envelope make it best suited for small titanium parts rather than large structural components.
Videos
Okuma America Corporation
OKUMA CORPORATION JAPAN
Okuma Europe GmbH
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Okuma America Corporation
Community Discussions
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