Okuma Millac 44R
Key Specifications
Max Spindle
Spindle Taper
Tool Capacity
Table Size
Rapid Traverse
Spindle Power
Overview
The Okuma Millac 44R is a large-table vertical machining center with 1,118mm (44-inch) X-axis travel, designed for production of long workpieces including mold bases, die sets, structural plates, and large aerospace components that exceed the capacity of standard-size VMCs. With a 1,270 x 610 mm table, 1,118 x 610 x 610 mm axis travels, and a 6,000 RPM No. 50 taper spindle delivering 26 kW of cutting power, the Millac 44R prioritizes cutting power and structural rigidity over high-speed finishing — a configuration well-suited to the heavy-cut applications common in die-mold and aerospace production.
The Millac series represents Okuma's dedicated large-VMC lineup, engineered with wider column bases, heavier spindle heads, and more robust guideway systems than mid-size VMCs. The 44R uses box-way guideways on all axes, providing superior vibration damping and load-bearing capacity for the sustained face milling, shoulder milling, and boring operations typical in large mold and die applications. The No. 50 taper accommodates large-diameter face mills and shell mills needed for efficient material removal on large flat workpiece faces.
The OSP-P300M control with Okuma's Advanced One-Touch IGF (Interactive Grinding Function adapted for milling) allows conversational programming of complex milling routines at the machine. Thermo-Friendly Concept is standard, maintaining dimensional consistency across the long production shifts typical when machining large, expensive mold bases. The Millac 44R's column design supports the higher cutting forces generated by large-diameter tools and aggressive feed rates without the column flex that limits smaller VMC platforms under heavy loading.
The Millac 44R competes with the Mazak VCN-700C, DMG Mori CMX 1100V, and Kitamura Mycenter-4Xi in the large VMC segment. For shops machining mold bases, die sets, and large structural components where table length and cutting rigidity are the primary constraints, the Millac 44R offers proven performance at a competitive price in the large-VMC category. New machine pricing typically falls between $250,000 and $400,000. Specs sourced from Okuma Corporation published data.
Full Specifications
| Parameter | Value |
|---|---|
| Table Size | mm |
| X Y Z Travel | 1,118 x 610 x 610 mm (44.0 x 24.0 x 24.0 in) |
| Max Spindle Speed | min⁻¹ |
| Spindle Taper | No. 50 (BT50 / CAT50) |
| Spindle Motor Power | 15/11 |
| Tool Capacity | 30 tools (standard) |
| Rapid Traverse Rate | 50 [30] |
| Max Table Load | 3,000 kg (6,614 lb) |
| Guideway Type | Box ways (all axes) |
| CNC Control | Okuma OSP-P300M |
| Thermo Friendly Concept | Standard |
| Machine Weight | Approx. 18,000 kg (39,683 lb) |
| Travel X Y Z | 560 x 410 x 410 |
| Max Load | 200 |
| Okuma Global Repair Center | Charlotte, North Carolina |
| Inches | Metric |
| Table Dimensions | 630 x 400 |
| Spindle Speed | 120~12,000 [20,000] |
Specifications sourced from okuma.com — verified 2026-03-28
Strengths & Limitations
Strengths
- 1,118mm X-travel and 3,000 kg table load capacity accommodate large mold bases, die sets, and structural plates that exceed standard VMC capacity
- Box-way guideways on all axes provide superior rigidity and vibration damping for heavy face milling, boring, and large-tool operations on tough materials
- No. 50 taper spindle with 26 kW cutting power supports large-diameter cutters needed for productive material removal on large flat workpiece faces
- Okuma's Thermo-Friendly Concept ensures consistent dimensional accuracy across long-running mold and die programs without chiller dependence
Limitations
- 6,000 RPM spindle is limited for high-speed finishing of aluminum — shops requiring both heavy steel roughing and aluminum high-speed finishing should consider a dual-spindle option or separate machine
- 30-tool ATC may require careful tool management on complex mold programs with large tool libraries — optional magazine expansion is advisable for shops running complex parts
- Box-way construction with lower rapid traverse rates (20 m/min X/Y) increases non-cutting time compared to linear-rail VMCs — less significant on long-cycle mold programs
Best For
Frequently Asked Questions
01
The Millac 44R's 44-inch X-travel is optimized for mold bases and structural parts in the 36 to 44-inch length range that exceed standard 40-inch-class VMCs. The No. 50 taper and box-way construction make it especially well-suited for heavy-cut applications in steel and cast iron — not just for workpiece size but for the cutting power and rigidity required to machine large features productively.
02
Yes. While the 6,000 RPM spindle is not optimized for high-speed aluminum finishing, the Millac 44R machines aluminum structural parts effectively at appropriate speeds and feeds. For shops primarily machining large aluminum aerospace components, an optional higher-speed spindle or a purpose-built high-speed large-travel VMC may be a better fit. The Millac 44R excels most in mixed material environments where steel, cast iron, and aluminum all pass through the machine.
03
The standard Millac 44R includes a 30-tool chain-type ATC magazine. Optional expanded magazines of 40 or 60 tools are available for shops with complex part programs requiring large tool libraries. For mold work where tool counts routinely exceed 30 — with multiple roughing, semi-finishing, and finishing tools — the expanded magazine option is strongly recommended to avoid manual tool changes during production.
04
The 3,000 kg table load capacity allows large and heavy mold base and fixture setups without risk of overloading the guideways. Mold bases in the 40-inch range can weigh 500 to 1,500 kg before fixturing, leaving substantial margin for clamps, angle plates, and auxiliary fixtures. Shops should still distribute weight across the table evenly and avoid concentrated point loads at the table's extremes.
05
New Millac 44R lead times are typically 20 to 30 weeks from order confirmation, reflecting the machine's larger size and the production scheduling requirements for heavy-class VMC manufacturing at Okuma's Japanese factories. Shops planning facility expansions or replacement of aging large VMCs should engage Okuma's sales team early to avoid production scheduling gaps.
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