Machine Comparison
Okuma MULTUS B750 vs Okuma MULTUS U4000
Okuma vs Okuma · Mill-Turn Machines
Summary
The Okuma MULTUS B750 and the Okuma MULTUS U4000 are both mill-turn machines with 40 tools, but they are sized for different parts. The Okuma MULTUS B750 turns up to 1,050 mm (41.34 in) in diameter; the Okuma MULTUS U4000 turns up to 650 mm (25.59 in).
The Okuma MULTUS B750 has the stronger spindle, 37/30 kW (50/40 hp) against 22/15 kW (30/20 hp), with an A2-11 nose as standard and a range of 11 rpm to 2,000 rpm. The Okuma MULTUS U4000 is the faster machine: 45 rpm to 4,200 rpm at the spindle and 50 m/min (1,968 ipm) rapid traverse on Xa/Za against 40 m/min, though its Xb axis is listed at 25 m/min (980 ipm). Its nose is JIS A2-8, with JIS A2-11 as an option.
Specifications Comparison
| Specification | Okuma MULTUS B750 | Okuma MULTUS U4000 |
|---|---|---|
| Max Turning Diameter | 1,050 mm (41.34 in) ▲ | 650 mm (25.59 in) |
| Max Spindle Speed | 11-2,000 rpm | 45–4,200 rpm ▲ |
| Spindle Power | 37/30 kW (50/40 hp) ▲ | 22/15 kW (30/20 hp) |
| Spindle Taper / Nose | A2-11 | JIS A2-8 [JIS A2-11] |
| Tool Capacity | 40 tools | 40 tools |
| Rapid Traverse | 40/40/40 m/min (1,575/1,575/1,575 ipm) | Xa/Za 50 m/min (1,968 ipm); Zb/Y 40 m/min (1,574 ipm); Xb 25 m/min (980 ipm) ▲ |
Advantages
Okuma MULTUS B750
- 1,050 mm (41.34 in) maximum turning diameter against 650 mm (25.59 in)
- 37/30 kW (50/40 hp) spindle against 22/15 kW (30/20 hp)
- A2-11 spindle nose as standard; it is an option on the Okuma MULTUS U4000
- Spindle range starts at 11 rpm for slow facing cuts on large diameters
Okuma MULTUS U4000
- 4,200 rpm top spindle speed against 2,000 rpm
- 50 m/min (1,968 ipm) rapid traverse on Xa/Za against 40 m/min
- Described for chucking and shaft parts within 650 mm (25.59 in)
Verdict
These machines fit different part sizes. Rings, flanges and housings up to 1,050 mm (41.34 in), and heavy cuts that draw on 37/30 kW (50/40 hp), call for the Okuma MULTUS B750. Chucking and shaft parts within 650 mm (25.59 in) are the Okuma MULTUS U4000's work: it spins to 4,200 rpm against 2,000 rpm and moves at up to 50 m/min (1,968 ipm), which suits smaller diameters. Both carry 40 tools.