Machine Comparison
Haas ST-20Y vs Okuma LB3000 EX II
Haas Automation vs Okuma · CNC Lathes
Summary
The Haas ST-20Y and Okuma LB3000 EX II are mid-size turning centers with 12-station turrets. The Haas comes with a ± 2 in (± 51 mm) Y axis as standard; the Okuma offers ±55 mm (2.17 in) of Y travel on its MY/MYW models. The Okuma is the larger and more powerful lathe.
The LB3000 EX II swings 413 mm (16.3 in) against 11.75 in (298 mm), takes 76 mm (3 in) bar against 2.5 in (64 mm), carries a 254 mm (10 in) chuck against 8.3 in (210 mm) and is rated 22 kW (30 hp) against 20 hp (14.9 kW). It spins to 5,000 RPM with the standard bore (4,200 RPM big bore) against 4,000 rpm, on an A2-8 nose against A2-6. Rapids are 25 m/min X, 30 m/min Z against 472 ipm (12 m/min). The Haas runs the NGC control; the Okuma runs OSP-P300L.
Specifications Comparison
| Specification | Haas ST-20Y | Okuma LB3000 EX II |
|---|---|---|
| Y-Axis Travel | ± 2 in (± 51 mm) | ±55 mm (2.17 in) (MY/MYW models) ▲ |
| Max Turning Diameter | 11.75 in (298 mm) | 413 mm (16.3 in) ▲ |
| Bar Capacity | 2.5 in (64 mm) | 76 mm (3 in) ▲ |
| Chuck Size | 8.3 in (210 mm) | 254 mm (10 in) |
| Max Spindle Speed | 4,000 rpm | 5,000 RPM (standard bore); 4,200 RPM (big bore) ▲ |
| Spindle Power | 20 hp (14.9 kW) | 22 kW (30 hp) ▲ |
| Spindle Taper / Nose | A2-6 | A2-8 |
| Tool Capacity | 12 | 12-station turret |
| Rapid Traverse | 472 ipm (12 m/min) | 25 m/min X, 30 m/min Z ▲ |
| Machine Weight | 10,480 lb (4,754 kg) | 4,800 kg (10,582 lb) |
Advantages
Haas ST-20Y
- Y axis of ± 2 in (± 51 mm) as standard on this model
- Haas Next Generation Control (NGC), shared with Haas mills
Okuma LB3000 EX II
- 413 mm (16.3 in) max turning diameter against 11.75 in (298 mm)
- 76 mm (3 in) bar capacity against 2.5 in (64 mm)
- 22 kW (30 hp) spindle against 20 hp (14.9 kW)
- 5,000 RPM standard-bore spindle against 4,000 rpm, and 30 m/min Z rapids
Verdict
Choose the Haas ST-20Y for short-run work up to 2.5 in (64 mm) bar with off-center features, in shops that already run Haas controls. Choose the Okuma LB3000 EX II for multi-shift production of larger parts, up to 76 mm (3 in) bar and a 413 mm (16.3 in) swing, where 30 hp and faster rapids matter, and specify the MY or MYW version if milled features are needed.