Okuma VTM-80YB
Key Specifications
Max Spindle
Tool Capacity
Rapid Traverse
Spindle Power
max turning diameter
max workpiece height
Overview
The Okuma VTM-80YB is a mid-range vertical turning and milling center with Y-axis and B-axis capability, positioning it as a true 5-axis multitasking platform for complex parts up to 800 mm (31.5 in) diameter. The YB designation indicates the inclusion of both Y-axis cross travel and B-axis milling spindle tilt, giving the machine full off-center machining capability that simpler vertical lathes cannot achieve.
The table spindle delivers 37/30 kW (50/40 hp) at up to 600 RPM with 800 Nm (590 ft-lb) of torque. Maximum workpiece height is 600 mm (23.6 in) with a table load capacity of 1,000 kg (2,205 lb). The table uses Okuma's direct-drive motor for smooth, precise C-axis indexing and contouring during milling operations.
The milling spindle runs up to 12,000 RPM with 22/18.5 kW (30/25 hp) through a CAT 40 (BT 40) taper. The B-axis tilts from -30 to +120 degrees with 0.001-degree minimum increment for precise angular positioning. X-axis travel is 650 mm (25.6 in), Y-axis is 400 mm (15.7 in), and Z-axis is 650 mm (25.6 in). The ATC holds 40 tools standard with options up to 80.
Rapid traverse is 30 m/min on X, Y, and Z axes. The machine uses roller guideways on the linear axes for the speed and rigidity balance needed in multitasking work. Okuma's Thermo-Friendly Concept compensates for the complex thermal patterns created when alternating between turning and milling operations.
The VTM-80YB competes with the Mazak Integrex e-670V, DMG Mori CTX gamma 2000 TC, and Hwacheon VT-950+ MC. Pricing runs $450,000-$650,000 new. Machine weight is approximately 22,000 kg (48,502 lb). The machine targets aerospace, energy, and precision job shops that need to turn, mill, drill, and contour complex parts in a single chucking to eliminate setup-induced errors.
Full Specifications
| Parameter | Value |
|---|---|
| Max Turning Diameter | 800 mm (31.5 in) |
| Max Workpiece Height | 600 mm (23.6 in) |
| Table Speed Max | 600 RPM |
| Table Power | 37/30 kW (50/40 hp) |
| Table Torque | 800 Nm (590 ft-lb) |
| Milling Spindle Speed | 12,000 RPM |
| Milling Spindle Power | 22/18.5 kW (30/25 hp) |
| Milling Spindle Taper | CAT 40 (BT 40) |
| B Axis Range | -30° to +120° (0.001° increment) |
| X Axis Travel | 1,120 |
| Y Axis Travel | 710 <±355> |
| Z Axis Travel | 1,135 |
| Tool Capacity | 40 (options: 60, 80) |
| Max Table Load | 1,000 kg (2,205 lb) |
| Rapid Traverse Rate | 30 m/min (X, Y, Z) |
| Machine Weight | 22,000 kg (48,502 lb) |
| CNC Control | Okuma OSP-P300L |
| Max Cutting Diameter | Ø800 |
| Max Cutting Length | 1,135 |
| Rapid Traverse Xy | 24 |
| Rapid Traverse Z | 20 |
| Rapid Traverse C | 20 |
| Max Spindle Speed | min⁻¹ |
| Spindle Motor Power | 30/22 |
| Okuma Global Repair Center | Charlotte, North Carolina |
| Inches | Metric |
| Spindle Speed | 8~800 |
Specifications sourced from okuma.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Full Y-axis and B-axis capability enables true 5-axis positioning for complex parts that simpler vertical lathes cannot machine
- 12,000 RPM milling spindle provides higher speeds than the VTM-65 and VTM-100 for better surface finish on aluminum and precision finishing
- 800 mm turning diameter with 1,000 kg table load covers the sweet spot for aerospace and energy components
- B-axis minimum increment of 0.001 degrees enables precise angular positioning for compound-angle features
- Direct-drive table motor provides smooth C-axis contouring during milling without the backlash of gear-driven tables
- Thermo-Friendly Concept compensates for the complex thermal patterns of alternating turning and milling operations
Limitations
- CAT 40 milling spindle is lighter-duty than the CAT 50 on the VTM-100 for heavy face milling and large-diameter boring operations
- 600 RPM maximum table speed limits turning surface footage compared to dedicated vertical lathes at this diameter range
- Complex 5-axis multitasking programs require advanced CAM software and experienced programmers to exploit the machine's full capability
- Capital cost of $450,000-$650,000 requires consistent complex-part volume to justify versus separate turning and milling machines
- 22,000 kg weight requires substantial foundation preparation
Best For
Frequently Asked Questions
01
A new VTM-80YB typically runs $450,000-$650,000 depending on milling spindle options, tool magazine capacity, and automation. The YB variant commands a premium over the base VTM models for the added Y-axis and B-axis capability.
02
YB indicates the machine includes both Y-axis (cross travel for off-center milling) and B-axis (milling spindle tilt). These axes, combined with X, Z, and C-axis table rotation, provide 5-axis positioning capability for complex part geometries that simpler vertical lathes cannot reach.
03
The VTM-80YB has a larger 800 mm turning diameter versus 650 mm, 1,000 kg table load versus 500 kg, more powerful table spindle (37 kW vs 30 kW), higher milling spindle speed (12,000 vs 10,000 RPM), and larger axis travels. The VTM-80YB also has a wider Y-axis range (400 mm vs 350 mm) for more off-center milling reach.
04
The VTM-80YB has the axes (X, Y, Z, B, C) for 5-axis work. It supports 5-axis positioning (indexing to angles and then cutting) standard. Simultaneous 5-axis contouring capability depends on control configuration and CAM software. For complex aerospace surfaces requiring continuous 5-axis, verify the specific configuration with Okuma.
05
Most major CAM systems support Okuma OSP post-processors for multitasking machines. Mastercam, Esprit, GibbsCAM, and Siemens NX all offer dedicated mill-turn post-processors for Okuma VTM machines. The complexity of multitasking programming typically requires a CAM system rather than manual G-code.
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