Okuma MB-8000H
Key Specifications
Max Spindle
Spindle Taper
Tool Capacity
Spindle Power
pallet size
max workpiece size
Overview
The Okuma MB-8000H is a large horizontal machining center designed for high-volume production of substantial workpieces on 800 x 800 mm pallets. Built on Okuma's box-way platform, the MB-8000H brings the rigidity and vibration-damping characteristics of box-guide construction to the 800 mm pallet class — targeting manufacturers in aerospace, heavy equipment, energy, and large-volume automotive applications where consistent material removal under load is essential.
The machine accommodates workpieces up to 1,200 mm diameter by 1,200 mm height with pallet loads up to 2,500 kg. The No. 50 spindle taper provides the clamping force and rigidity required for heavy steel cutting and large-diameter face milling operations typical in this class. Multiple spindle configurations are available, from the standard 6,000 RPM steel-optimized spindle to higher-speed options for shops machining aluminum and mixed materials. A 60-tool magazine is standard.
Box-way construction on all axes defines the MB-8000H's machining character. Where the MA-8000H uses linear guides for maximum acceleration and rapid traverse speed, the MB-8000H prioritizes structural stiffness and vibration damping — resulting in superior surface finish quality on large steel and cast iron workpieces and extended tool life during aggressive roughing operations. Rapid traverse is lower than linear-guide alternatives but adequate for the long cycle times typical on large parts.
The MB-8000H runs on Okuma's OSP-P500M control with Thermo-Friendly Concept, Anti-Crash System, Process Navi, and Servo Navi — the same feature set as Okuma's complete large-HMC lineup. Dual pallet changer is standard. The MB-8000H competes with the Mazak HCN-8800, DMG Mori NHX 8000, and Toyoda FH1000J in the 800 mm box-way class. New pricing runs $550,000–$900,000 depending on spindle and options. Specs sourced from Okuma published data.
Full Specifications
| Parameter | Value |
|---|---|
| Pallet Size | 800 x 800 mm (31.5 x 31.5 in) |
| Max Workpiece Size | ø1,200 x 1,200 mm (ø47.2 x 47.2 in) |
| Max Pallet Load | 2,500 kg (5,512 lb) |
| Max Spindle Speed | 6,000 RPM standard (10,000 / 12,000 RPM optional) |
| Spindle Taper | No. 50 |
| Spindle Motor Power | 30/22 kW (10 min/continuous) standard |
| Tool Capacity | 60 tools standard |
| Guideway Type | Box ways (all axes) |
| Pallet System | Dual pallet changer (standard) |
| CNC Control | Okuma OSP-P500M |
| Thermo Friendly Concept | Standard |
| Anti Crash System | Standard |
| Process Navi | Standard |
| Servo Navi | Standard |
Strengths & Limitations
Strengths
- Box-way construction delivers exceptional vibration damping for large-part steel and cast iron machining, producing superior surface finish compared to linear-guide 800 mm HMCs
- No. 50 spindle taper provides the rigidity and clamping force required for heavy-duty roughing on large steel workpieces
- 2,500 kg pallet load capacity handles heavy castings, tombstone setups, and large weldments without exceeding capacity
- Dual pallet changer standard enables continuous production — loading off-machine while cutting in-cycle
- Thermo-Friendly Concept maintains dimensional accuracy across shifts on large workpieces where thermal growth is proportionally more significant
- Multiple spindle options allow configuration for primarily steel work or mixed-material production including aluminum
Limitations
- Box-way rapid traverse is slower than linear-guide competitors like the MA-8000H — non-cutting time is higher on programs with many rapid moves
- Standard 6,000 RPM spindle is too slow for versatile production; most shops need to specify the 10,000 or 12,000 RPM option
- 60-tool standard magazine may be limiting for complex multi-operation programs on large parts
- Large machine footprint and weight require substantial floor preparation and foundation work
- Premium pricing at $550,000–$900,000 requires consistent large-part production to justify over smaller 630 mm class machines
Best For
Frequently Asked Questions
01
New MB-8000H machines typically price between $550,000 and $900,000. The standard 6,000 RPM spindle with 60-tool magazine is the base configuration. Higher-speed spindle options, expanded tool magazines, through-spindle coolant, and multi-pallet automation systems add substantially to the price. Used MB-8000H machines from 2010–2018 trade between $200,000 and $450,000 depending on hours, spindle condition, and configuration.
02
The MB-8000H uses box-way construction for maximum rigidity and vibration damping, while the MA-8000H uses linear guides for higher rapid traverse speeds and acceleration. The MB-8000H is the better choice for shops primarily machining steel and cast iron where surface finish and tool life under heavy cuts drive quality and economics. The MA-8000H suits shops where cycle time reduction on lighter cuts and aluminum is the priority.
03
The standard 6,000 RPM spindle is adequate for dedicated steel and cast iron shops running heavy roughing cycles. The 10,000 RPM option is the best all-around choice for mixed-material shops needing steel cutting torque and adequate aluminum capability. The 12,000 RPM option suits shops with significant aluminum or light alloy production volume. Most general production shops specify the 10,000 RPM spindle.
04
Yes, particularly with the No. 50 spindle taper and box-way construction providing the rigidity required for difficult-to-machine materials. The key is running conservative cutting parameters with sharp tooling and high-pressure coolant. For dedicated difficult-materials applications with very heavy cuts in Inconel or titanium, the MA-8000H's high-torque spindle option (1,071 Nm) may be the stronger choice.
05
Beyond the standard dual pallet changer, the MB-8000H supports multi-pallet pool automation systems for extended unattended production. Robot tending, pallet storage systems, and fixture automation are all compatible. Okuma's cell controller software manages scheduling, tool life, and machine utilization reporting across multi-pallet automation systems.
Videos
Machinery Resources International
Revelation Machinery
Resell CNC
Okuma America Corporation
OKUMA CORPORATION JAPAN
Community Discussions
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