Machine Comparison
Okuma MULTUS B550 vs Okuma MULTUS B750
Okuma vs Okuma · Mill-Turn Machines
Summary
The Okuma MULTUS B550 and Okuma MULTUS B750 are both from Okuma's mill-turn machines lineup, making this a common upgrade or lineup decision for shops already invested in the Okuma ecosystem. The Okuma MULTUS B550 leads in rapid traverse (36 m/min (X), 30 m/min (Z) vs 30 m/min (X), 24 m/min (Z)). The Okuma MULTUS B750 shows specification advantages in 6 categories, though the Okuma MULTUS B550 may still be the better choice depending on your shop's specific needs and the type of work you run. Both machines are proven performers in production environments and represent solid investments for shops in the market for a mill-turn machine.
Specifications Comparison
| Specification | Okuma MULTUS B550 | Okuma MULTUS B750 |
|---|---|---|
| Tool Capacity | 40 (options: 60, 80, 120, 160) | 40 (options: 60, 80, 120, 160, 200) |
| Rapid Traverse | 36 m/min (X), 30 m/min (Z) ▲ | 30 m/min (X), 24 m/min (Z) |
| Bar Capacity | 104 mm (4.09 in) | 130 mm (5.12 in) ▲ |
| Max Turning Diameter | 850 mm (33.5 in) | 1,050 mm (41.3 in) ▲ |
| Control | Okuma OSP-P300SA | Okuma OSP-P500 |
| Max Machining Length | 3,000 mm (118.1 in) | Up to 6,000 mm (236.2 in) ▲ |
| Main Spindle Speed | 3,000 RPM ▲ | 2,500 RPM |
| Main Spindle Power | 37/30 kW (50/40 hp) | 45/37 kW (60/50 hp) ▲ |
| Main Spindle Torque | 700 Nm (516 ft-lb) | 1,200 Nm (885 ft-lb) ▲ |
| Spindle Nose | A2-11 | A2-11 |
| Milling Spindle Speed | 10,000 RPM | 10,000 RPM |
| Milling Spindle Power | 30/22 kW (40/30 hp) | 37/30 kW (50/40 hp) ▲ |
| Milling Tool Interface | Capto C8 | Capto C8 |
| B Axis Range | -30° to +195° (225° swing, 0.001° increment) | -30° to +195° (225° swing, 0.001° increment) |
| Price Range | $700,000 - $1,000,000 ▲ | $1,000,000 - $2,000,000+ |
Advantages
Okuma MULTUS B550
- Faster rapid traverse at 36 m/min (X), 30 m/min (Z) reduces non-cutting time between operations
- Superior main spindle speed at 3,000 RPM vs 2,500 RPM
- More competitive pricing at $700,000 - $1,000,000 compared to $1,000,000 - $2,000,000+
Okuma MULTUS B750
- Superior bar capacity at 130 mm (5.12 in) vs 104 mm (4.09 in)
- Superior max turning diameter at 1,050 mm (41.3 in) vs 850 mm (33.5 in)
- Superior max machining length at Up to 6,000 mm (236.2 in) vs 3,000 mm (118.1 in)
- Superior main spindle power at 45/37 kW (60/50 hp) vs 37/30 kW (50/40 hp)
- Superior main spindle torque at 1,200 Nm (885 ft-lb) vs 700 Nm (516 ft-lb)
Verdict
The Okuma MULTUS B750 edges ahead on specifications in this comparison, particularly in Bar Capacity and Max Turning Diameter. However, the Okuma MULTUS B550 remains competitive and may be the better choice depending on price, dealer support in your area, or specific workholding and tooling considerations. Both are capable machines — the best decision comes from running your actual parts and evaluating total cost of ownership including tooling, training, and service.