Okuma HB630

$450,000 - $700,000 Updated 2026-03-16

Key Specifications

Max Spindle

6,000 RPM (standard); 10,000 RPM (optional)

Spindle Taper

No. 50 (BT50 / CAT50)

Tool Capacity

60 tools (standard); 120+ tools (optional)

Rapid Traverse

40 m/min (X/Y/Z)

Spindle Power

37/26 kW (peak/continuous) (50/35 hp)

pallet size

630 x 630 mm (24.8 x 24.8 in)

Overview

The Okuma HB630 is a 630mm pallet horizontal machining center that delivers flexible, high-accuracy production for large prismatic workpieces in aerospace, heavy equipment, and industrial manufacturing. The HB630 is designed as a flexible production platform rather than a pure-speed machine — balancing axis traverse, spindle performance, and workpiece capacity to handle the diverse large-part requirements of job shops and aerospace suppliers running varied work.

The 630 x 630 mm pallet supports workpieces up to 1,000 mm diameter and 1,100 mm tall with a table load of 1,500 kg — specifications that accommodate large tombstone setups and heavy steel and titanium workpieces. The 6,000 RPM No. 50 spindle produces 37 kW (50 hp) of peak power, providing the cutting torque necessary for aggressive roughing in hard materials that define large aerospace and energy component production. Rapid traverse of 40 m/min on X/Y/Z maintains competitive cycle times for a machine of this capacity class.

Okuma's Thermo-Friendly Concept is particularly critical on large-format machines like the HB630 because thermal deformation is amplified over longer axis travels — small thermal gradients that are negligible on a 400mm machine become significant over 900mm of traverse. The OSP-P500M control with Anti-Crash System, Machining Navi, and Servo Navi provides the full Okuma intelligence suite for production reliability. A 60-tool ATC is standard, expandable to 120+ tools for high-complexity large-part programs.

The HB630 competes with the Mazak HCN-6800, DMG Mori NHX 6300, Makino a81, and JTEKT Toyoda FA630II in the 630mm HMC class. For shops that want Okuma OSP control and Thermo-Friendly Concept thermal management in a large-format HMC, the HB630 is the flagship choice in this size class. New HB630 machines price between $450,000 and $700,000 depending on configuration and automation. Specs sourced from Okuma Corporation published data.

Full Specifications

Parameter	Value
Pallet Size	630 x 630 mm (24.8 x 24.8 in)
Max Workpiece Size	ø1,000 x 1,100 mm (ø39.4 x 43.3 in)
X Y Z Travel	900 x 900 x 900 mm (35.4 x 35.4 x 35.4 in)
Max Spindle Speed	6,000 RPM (standard); 10,000 RPM (optional)
Spindle Taper	No. 50 (BT50 / CAT50)
Spindle Motor Power	37/26 kW (peak/continuous) (50/35 hp)
Tool Capacity	60 tools (standard); 120+ tools (optional)
Rapid Traverse Rate	40 m/min (X/Y/Z)
Max Table Load	1,500 kg (3,307 lb)
Guideway Type	Linear guides (X/Y); Box ways (Z) optional
CNC Control	Okuma OSP-P500M
Thermo Friendly Concept	Standard
Anti Crash System	Standard
Pallet System	Dual pallet changer standard
Okuma Global Repair Center	Charlotte, North Carolina

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

Strengths & Limitations

Strengths

No. 50 taper spindle with 37 kW peak power provides the cutting torque required for heavy roughing in aerospace titanium, steel, and cast iron on large workpieces
630mm pallet with 1,500 kg load capacity handles large tombstone configurations and heavy fixturing for complex multi-face large-part production
Thermo-Friendly Concept on a 900mm travel machine maintains large-part dimensional accuracy across production shifts — particularly valuable where small thermal gradients produce large positional errors over long travels
60-tool standard ATC with expandable magazine supports the large tool requirements of complex aerospace and heavy equipment programs without mid-program interruption

Limitations

6,000 RPM standard spindle is limiting for aluminum finishing applications where higher RPM would allow faster surface speeds and better finish
40 m/min rapids, while adequate for large-part work, are slower than smaller HMC competitors at 60 m/min — positional moves between features on complex programs add non-cutting time
1,500 kg table load is lower than some competitors in the 630mm class (some offer 2,000+ kg), which may limit very heavy workpiece or tombstone configurations

Best For

Aerospace prime contractors and Tier 1 suppliers machining large structural components, bulkheads, wing ribs, and frames requiring 4-sided access in a single HMC setup Heavy equipment OEMs producing large gearbox housings, hydraulic manifolds, and frame castings at medium production volume with consistent quality requirements Defense manufacturers machining large precision housings, actuator bodies, and vehicle drivetrain components from alloy steel and aluminum Job shops serving aerospace, energy, and heavy industrial markets that need a large-format HMC with Okuma reliability and OSP control support

Frequently Asked Questions

01 How does the HB630 differ from the HB400 in Okuma's lineup?

The HB630 uses a 630mm pallet versus the HB400's 400mm pallet, providing substantially more workpiece and tombstone capacity. The HB630 uses a No. 50 taper spindle with 37 kW for heavy cutting, while the HB400 uses No. 40 with 26 kW for higher-speed production. The HB400 runs 60 m/min rapids versus 40 m/min on the HB630, making the HB400 faster for lighter work while the HB630 handles heavier materials and larger parts.

02 What is the B-axis table indexing capability on the HB630?

The standard HB630 table indexes at 1-degree increments for 4-face production setup. A full CNC B-axis option provides 0.001-degree continuous 4th axis capability for interpolated machining of helical features, angled bores, and angular pocket geometry. The CNC B-axis is particularly valuable for aerospace structural parts with compound-angle bolt patterns and angled intersecting bores.

03 Can the HB630 be integrated with a multi-machine FMS for large-part production?

Yes. The HB630 is designed for FMS integration via Okuma's own pallet management platform or third-party FMS systems. Rail-guided or cart-type pallet transport links the HB630 to other machines, load stations, and wash stations. Large-part FMS installations typically include automated crane or AGV systems given the 1,500 kg pallet load capacity. Okuma provides FMS integration engineering support for complex cell designs.

04 What spindle options are available beyond the standard 6,000 RPM?

A 10,000 RPM spindle option is available for shops with higher aluminum content that require faster surface speeds for finishing operations. The 10,000 RPM option uses a different bearing arrangement optimized for higher speed at some reduction in maximum torque. Most aerospace and heavy equipment shops choose the standard 6,000 RPM spindle for its torque advantage in hard metal roughing.

05 What through-spindle coolant pressure is available on the HB630?

Through-spindle coolant is available as an option on the HB630, typically at 20 bar (290 psi) standard. Higher pressure options of 40 to 70 bar (580 to 1,000 psi) are available for titanium deep-hole drilling and aerospace production applications requiring effective chip evacuation from deep features. High-pressure TSC is recommended for any deep hole application in titanium or stainless steel on the HB630.