Machine Comparison
Mazak Quick Turn 250M vs Okuma LB3000 EX II
Yamazaki Mazak vs Okuma · CNC Lathes
Summary
The Mazak Quick Turn 250M and the Okuma LB3000 EX II are 10 in chuck turning centers of the same class. Both take Ø3 in (76 mm) bar, both run a 10 in chuck, and both carry 12 tools on the turret, so the differences are in diameter and spindle speed.
The Okuma LB3000 EX II turns larger work, with a 413 mm (16.3 in) maximum turning diameter against Ø15 in (381 mm). It also spins faster: 5,000 RPM on the standard-bore spindle and 4,200 RPM on the big-bore version, against the Mazak's 4,000 rpm. The Quick Turn 250M is the milling variant of its line, aimed at flanges, hubs and rings with drilled bolt circles; Okuma offers milling on its MYW configuration.
Specifications Comparison
| Specification | Mazak Quick Turn 250M | Okuma LB3000 EX II |
|---|---|---|
| Max Turning Diameter | Ø15 in (381 mm) | 413 mm (16.3 in) ▲ |
| Bar Capacity | Ø3 in (76 mm) | 76 mm (3 in) |
| Chuck Size | 10 in | 254 mm (10 in) |
| Max Spindle Speed | 4,000 rpm | 5,000 RPM (standard bore); 4,200 RPM (big bore) ▲ |
| Tool Capacity | 12 tools | 12-station turret |
Advantages
Mazak Quick Turn 250M
- Milling built into the 250M for drilled bolt circles on flanges, hubs and rings, where the Okuma needs its MYW configuration
Okuma LB3000 EX II
- Larger turning diameter: 413 mm (16.3 in) against Ø15 in (381 mm)
- Spindle speed of 5,000 RPM (standard bore) or 4,200 RPM (big bore) against 4,000 rpm
Verdict
For flanges, hubs and rings that need drilled bolt circles in the same setup, the Mazak Quick Turn 250M is the direct fit at up to Ø15 in (381 mm). For production turning of bar up to 76 mm (3 in) and slightly larger parts, the Okuma LB3000 EX II is the stronger choice, with 413 mm (16.3 in) of turning diameter and up to 5,000 RPM, and it suits shops already standardized on Okuma controls.