Okuma GENOS L300
Key Specifications
Max Spindle
Spindle Power
Max Turn Length
chuck size
swing over bed
max turning diameter
Overview
The Okuma GENOS L300 is an 8-inch chuck CNC turning center in Okuma's accessible GENOS product line, designed to bring Okuma's quality, accuracy, and OSP control reliability to job shops and production facilities at a competitive price point. With a 380mm swing over bed, maximum turning diameter of 320mm, and maximum turning length of 700mm, the GENOS L300 covers the medium-diameter range most commonly produced in job shop turning operations — shafts, bushings, flanges, and housings in the 150mm to 300mm diameter class.
Like all GENOS machines, the L300 is built in Okuma's Japanese manufacturing facilities to the same structural and quality standards as the flagship LB series, but configured with essential rather than maximum specifications. The OSP-P300L control provides full conversational turning programming, allowing operators to write turning programs at the machine without CAM software using Okuma's interactive cycle definition. Thermo-Friendly Concept thermal compensation is included as a standard feature, maintaining consistent turning diameter accuracy across production shifts without spindle warmup routines.
The L300's 8-inch chuck with 4,000 RPM spindle and 18.5 kW of cutting power handles aluminum, steel, and stainless turning across a wide range of diameters. A 10-station turret with optional live tooling accommodates shops requiring off-center drilling, milling, and tapping capabilities on turned parts. The machine's slant-bed construction with 45-degree inclined ways provides natural chip evacuation and operator access consistent with modern turning center design. An 8-bar (116 PSI) programmable coolant system is standard for chip control and tool life extension.
The GENOS L300 competes with the Mazak Quick Turn 250M, Haas ST-30, DMG Mori CLX 450, and Doosan Lynx 300 in the mid-size turning center segment. For shops seeking Okuma quality and OSP familiarity without the premium of the LB4000 EX II, the GENOS L300 offers a well-proven platform at a lower capital cost. New machine pricing typically falls between $100,000 and $180,000. Specs sourced from Okuma Corporation published data.
Full Specifications
| Parameter | Value |
|---|---|
| Chuck Size | 8 in (203 mm) |
| Swing Over Bed | 380 mm (15.0 in) |
| Max Turning Diameter | 300 mm |
| Max Turning Length | 520 mm |
| Max Spindle Speed | 4,000 |
| Spindle Motor Power | 11 kW |
| Spindle Bore | 65 mm (2.6 in) |
| Turret Stations | 10 |
| Rapid Traverse Z | 20 m/min |
| Rapid Traverse X | 15 m/min |
| CNC Control | Okuma OSP-P300L |
| Guideway Type | Box ways |
| Thermo Friendly Concept | Standard |
| Machine Weight | Approx. 5,500 kg (12,125 lb) |
Specifications sourced from machinio.com — verified 2026-03-28
Strengths & Limitations
Strengths
- GENOS pricing brings Okuma quality, OSP control, and Thermo-Friendly Concept to shops that cannot justify the LB series price, with the same Japanese manufacturing standards
- OSP-P300L conversational programming allows operators to write and edit turning programs at the machine without CAM software, reducing programming bottlenecks
- 8-inch chuck with 18.5 kW spindle handles the full range of medium-diameter turning in steel, stainless, and aluminum without compromise
- Optional live tooling eliminates secondary VMC setups for parts requiring off-center holes, slots, or milled flats — reducing total cycle time and fixturing costs
Limitations
- 700mm maximum turning length restricts the machine to medium-length parts — shops regularly turning shafts longer than 700mm need the L400 or LB4000 class
- 10-station turret may be limiting for complex parts requiring many different tools — higher-complexity turning often benefits from 12-station configurations
- GENOS line omits some advanced diagnostics and monitoring features standard on the flagship LB series, such as the full Collision Avoidance System
Best For
Frequently Asked Questions
01
The GENOS L300 is the accessible-value version of Okuma's 8-inch lathe class, while the LB4000 EX II is the heavy-duty flagship with a 10-inch chuck, 37 kW spindle, and the full Collision Avoidance System. The GENOS L300 covers the most common medium-diameter production range at a lower price, while the LB4000 EX II addresses the large, heavy-cut segment where maximum rigidity and cutting power are required.
02
Live tooling is an available option on the GENOS L300. With live tooling, the machine can perform driven tool operations including drilling, tapping, and end milling on OD faces, end faces, and cross features of turned parts. A C-axis position encoder enables precise rotational positioning for live tooling work. Shops should specify live tooling at the time of order as it is not field-retrofittable on all configurations.
03
Okuma's OSP conversational programming for turning uses interactive dialog screens where the operator enters workpiece geometry, material type, and operation type. The control automatically calculates speeds, feeds, and toolpaths based on the inputs. The operator can preview the generated path graphically before execution. This approach allows skilled machinists to program new jobs at the machine without CAM software, reducing programming lead time for new parts.
04
The GENOS L300 spindle bore is 65mm, accommodating bar stock up to approximately 60mm in diameter through the spindle. For bar work, a separate bar feeder unit is connected to the spindle end and integrates with the OSP control for automatic bar advance and part cutoff cycles. Shops running high-volume bar turning can achieve high productivity with the L300 paired with a proven bar feeder brand such as LNS or Iemca.
05
Okuma provides a standard one-year parts and labor warranty on new GENOS L300 machines. Extended warranty programs and preventive maintenance contracts are available through Okuma's distributor network. Okuma's North American technical support provides remote diagnostics via the OSP control's built-in remote monitoring capabilities, allowing Okuma engineers to diagnose many issues without an on-site visit.
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