Machine Comparison
Okuma MULTUS B300II vs Okuma MULTUS B400II
Okuma vs Okuma · Mill-Turn Machines
Summary
The Okuma MULTUS B300II and Okuma MULTUS B400II are consecutive sizes in Okuma's B-series multitasking line. The B400II is the bigger machine across the board: it turns 710 mm (27.95 in) against 630 mm (24.80 in), uses a JIS A2-8 nose (A2-11 optional) against A2-6 (A2-8 optional), and carries 40 tools as standard against 20, with options of 60, 80 and 120.
The B400II's VAC 22/15 kW (VAC 30/20 hp) spindle also outpowers the B300II's VAC 15/11 kW (VAC 20/15 hp). Both rapid at 40 m/min in X and Z, and the B300II also lists 26 m/min in Y. The B300II is the smaller step for shops whose parts do not need the larger swing or tool count.
Specifications Comparison
| Specification | Okuma MULTUS B300II | Okuma MULTUS B400II |
|---|---|---|
| Max Turning Diameter | 630 mm (24.80 in) | 710 mm (27.95 in) ▲ |
| Spindle Power | VAC 15/11 kW (VAC 20/15 hp) | VAC 22/15 kW (VAC 30/20 hp) ▲ |
| Spindle Taper / Nose | JIS A2-6 [JIS A2-8] | JIS A2-8 [JIS A2-11] |
| Rapid Traverse | 40/26 m/min (1,575/1,024 ipm), X,Z/Y | 40 m/min (X, Z) |
Advantages
Okuma MULTUS B300II
- Sized for medium-complexity parts within a 630 mm (24.80 in) swing
- 20-tool magazine suits part families that share tooling
- Same 40 m/min X and Z rapids as the B400II
Okuma MULTUS B400II
- 710 mm (27.95 in) turning diameter against 630 mm (24.80 in)
- VAC 22/15 kW (VAC 30/20 hp) spindle against VAC 15/11 kW (VAC 20/15 hp)
- 40 tools standard, with options up to 120, against 20
- JIS A2-8 nose with an A2-11 option for larger bar and chucks
Verdict
The Okuma MULTUS B400II is the choice for long landing gear parts, valve stems, drill collars and other larger work that needs a 710 mm swing, the stronger spindle and 40 or more tools. The Okuma MULTUS B300II suits aerospace, hydraulic and precision shops running medium-complexity parts within a 630 mm swing, where a 20-tool magazine covers the part families and the larger machine's capacity would go unused.