Machine Comparison
Niles-Simmons N20 MC vs Okuma MULTUS B200II
Niles-Simmons vs Okuma · Mill-Turn Machines
Summary
The Niles-Simmons N20 MC and the Okuma MULTUS B200II are both mill-turn machines, but the published spindle figures put them in different weight classes. The Niles-Simmons N20 MC lists main spindles of 34 | 30.4 kW (A8) and 40 | 31 kW (A11); the Okuma MULTUS B200II lists 11/7.5 kW (15/10 hp), 20 min/cont. The table for this pair is short and has no travel or turning-length rows.
The Okuma MULTUS B200II spins faster, 50~6,000 min⁻¹ (45~5,000 min⁻¹ optional) against 0 – 2,500 (3,800) rpm on the A8 spindle and 0 – 1,800 rpm on the A11. Its rapids are 40/26 m/min (1,575/1,024 ipm) for X,Z/Y against 25 | 12 | 40 m/min (X, Y, Z). The Niles-Simmons N20 MC carries more tools, 48 (60) | 96 (120) pockets against 20 tools.
Specifications Comparison
| Specification | Niles-Simmons N20 MC | Okuma MULTUS B200II |
|---|---|---|
| Max Spindle Speed | 0 – 2,500 (3,800) rpm (A8); 0 – 1,800 rpm (A11) | 50~6,000 min⁻¹ [45~5,000 min⁻¹ optional] ▲ |
| Spindle Power | 34 | 30.4 kW (A8); 40 | 31 kW (A11); 40% | 100% duty cycle | PREX 11/7.5 kW (15/10 hp), 20 min/cont |
| Spindle Taper / Nose | A8 | A11 (DIN 55026) | Ø140 flat [JIS A2-6] |
| Tool Capacity | 48 (60) | 96 (120) pockets ▲ | 20 tools |
| Rapid Traverse | 25 | 12 | 40 m/min (X, Y, Z) | 40/26 m/min (1,575/1,024 ipm), X,Z/Y |
Advantages
Niles-Simmons N20 MC
- Main spindle power of 34 | 30.4 kW (A8) or 40 | 31 kW (A11) against 11/7.5 kW (15/10 hp)
- 48 (60) | 96 (120) pockets in the magazine against 20 tools
Okuma MULTUS B200II
- Higher spindle speed: 50~6,000 min⁻¹ against 0 – 2,500 (3,800) rpm on the A8 spindle
- Faster X and Y rapids: 40 m/min and 26 m/min against 25 m/min and 12 m/min; Z is 40 m/min on both
Verdict
The published figures point to different work. The Niles-Simmons N20 MC, with 40 | 31 kW on the A11 spindle and up to 96 (120) pockets, suits heavier shafts and chucked parts that need power and a large tool inventory. The Okuma MULTUS B200II, with 50~6,000 min⁻¹ and 40/26 m/min rapids, suits small shafts and bar parts turned and milled in one setup. Compare travels and turning lengths on each machine's own page, since this table does not carry them.