Machine Comparison
Okuma GI-10NII vs Okuma GI-20NII
Okuma vs Okuma · CNC Grinding Machines
Summary
The Okuma GI-10NII and Okuma GI-20NII are both from Okuma's cnc grinding machines lineup, making this a common upgrade or lineup decision for shops already invested in the Okuma ecosystem. The Okuma GI-20NII leads in x travel (165 mm (6.50 in) vs 140 mm (5.51 in)). The Okuma GI-20NII shows specification advantages in 8 categories, though the Okuma GI-10NII 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 cnc grinding machine.
Specifications Comparison
| Specification | Okuma GI-10NII | Okuma GI-20NII |
|---|---|---|
| X-Axis Travel | 140 mm (5.51 in) | 165 mm (6.50 in) ▲ |
| Z-Axis Travel | 120 mm (4.72 in) | 150 mm (5.91 in) ▲ |
| Control | Okuma OSP-P300G | Okuma OSP-P300G |
| Max Bore Diameter | 100 mm (3.9 in) | 200 mm (7.9 in) ▲ |
| Min Bore Diameter | 10 mm (0.4 in) | 20 mm (0.8 in) ▲ |
| Max Bore Depth | 100 mm (3.9 in) | 150 mm (5.9 in) ▲ |
| Max Workpiece Od | 200 mm (7.9 in) | 300 mm (11.8 in) ▲ |
| Grinding Spindle Speed | Up to 60,000 RPM ▲ | Up to 40,000 RPM |
| Min Feed Increment | 0.0001 mm (0.000004 in) | 0.0001 mm (0.000004 in) |
| Workhead Speed | 50 - 600 RPM ▲ | 40 - 500 RPM |
| Face Grinding | Yes | Yes |
| Machine Weight | 3,500 kg (7,716 lb) | 5,000 kg (11,023 lb) ▲ |
| Floor Space | 2,800 x 2,200 mm (110 x 87 in) | 3,200 x 2,400 mm (126 x 94 in) ▲ |
| Workholding | Chuck or collet | Chuck, faceplate, or collet |
| Price Range | $180,000 - $260,000 ▲ | $220,000 - $310,000 |
Advantages
Okuma GI-10NII
- Superior grinding spindle speed at Up to 60,000 RPM vs Up to 40,000 RPM
- Superior workhead speed at 50 - 600 RPM vs 40 - 500 RPM
- More competitive pricing at $180,000 - $260,000 compared to $220,000 - $310,000
Okuma GI-20NII
- Greater x travel of 165 mm (6.50 in) accommodates larger workpieces
- Greater z travel of 150 mm (5.91 in) accommodates larger workpieces
- Superior max bore diameter at 200 mm (7.9 in) vs 100 mm (3.9 in)
- Superior min bore diameter at 20 mm (0.8 in) vs 10 mm (0.4 in)
- Superior max bore depth at 150 mm (5.9 in) vs 100 mm (3.9 in)
Verdict
The Okuma GI-20NII edges ahead on specifications in this comparison, particularly in X Travel and Z Travel. However, the Okuma GI-10NII 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.