Okuma GENOS L400II

Est. $110,000 - $180,000 Updated 2026-08-10

Key Specifications

Rapid Traverse

X 20 m/min (66 fpm); Z 30 m/min (98 fpm)

Max Turn Length

500 mm (19.69 in)

max turning diameter

330 mm (12.99 in)

spindle nose

JIS A2-8

spindle speed

30~3,000 min⁻¹

spindle motor 30 min

11 kW (15 hp)

Overview

The Okuma GENOS L400II is a horizontal CNC turning center built for chucking and short shaft work rather than long bar production.

The working envelope is 330 mm (12.99 in) maximum turning diameter by 500 mm (19.69 in) maximum turning length. That turning diameter is the number to plan against regardless of what the model designation suggests. It is the practical limit on flanges, housings, hubs and disc-shaped components, and it places the machine in the mid-size chucking class rather than the large-swing class. The 500 mm turning length pairs sensibly with it: parts in this diameter range are usually short relative to their diameter, and a longer bed would mostly add floor space rather than capability.

The spindle nose is JIS A2-8, and on a machine of this size that is the significant specification. An A2-8 nose is a substantially larger and stiffer mount than what smaller turning centers carry, so the machine will hold a heavy chuck and absorb the overhung load of a large-diameter workpiece without the spindle mounting becoming the limiting element in the cut.

Spindle speed runs 30~3,000 min⁻¹. The ceiling is deliberately modest — at 330 mm diameter the surface speed at the outside of the part is already high — and the 30 min⁻¹ low end is what allows heavy facing and boring at large diameters where cutting speed has to come down. Power is 11 kW (15 hp) at the 30-minute rating and 7.5 kW (10 hp) continuous. Those are moderate figures, and shops planning sustained roughing in tough alloys should size depth of cut against the 7.5 kW continuous number rather than the short-duty peak.

Rapid traverse is 20 m/min (66 fpm) in X and 30 m/min (98 fpm) in Z. The faster Z reflects where the long moves are on a turning center — indexing along the part between operations — while the shorter X axis does not need matching speed.

The L400II suits job shops and production shops turning mid-size chucked components in steel, stainless and cast iron, where the return is in build quality and control rather than in headline specifications.

Full Specifications

Parameter	Value
Max Turning Diameter	330 mm (12.99 in)
Max Turning Length	500 mm (19.69 in)
Spindle Nose	JIS A2-8
Spindle Speed	30~3,000 min⁻¹
Spindle Motor 30 Min	11 kW (15 hp)
Spindle Motor Continuous	7.5 kW (10 hp)
Rapid Traverse Rate	X 20 m/min (66 fpm); Z 30 m/min (98 fpm)

Specifications sourced from okuma.com — verified 2026-08-09

Strengths & Limitations

Strengths

330 mm (12.99 in) maximum turning diameter by 500 mm (19.69 in) length puts flanges, housings, hubs and discs squarely in scope
JIS A2-8 spindle nose is a substantially stiffer mount than smaller turning centers carry, so a heavy chuck and an overhung workpiece do not make the spindle mounting the limiting element
A 30 min⁻¹ low-end spindle speed is what allows heavy facing and boring at full diameter where cutting speed has to come down
Rapid traverse of 30 m/min (98 fpm) in Z suits the long indexing moves along a part between operations
Turning length and diameter are sensibly matched — parts in this diameter range are usually short, so a longer bed would add floor space rather than capability

Limitations

Spindle power is 11 kW (15 hp) at the 30-minute rating and only 7.5 kW (10 hp) continuous, so sustained roughing in tough alloys has to be sized against the continuous figure
The 3,000 min⁻¹ ceiling limits surface speed on small-diameter work
Maximum turning length of 500 mm (19.69 in) rules out long shaft production
X-axis rapid of 20 m/min (66 fpm) is modest and does not match the Z axis

Best For

Job and production shops turning mid-size chucked components in steel, stainless and cast iron Flanges, housings, hubs and disc-shaped parts inside 330 mm (12.99 in) diameter Heavy facing and boring at full diameter where low-end spindle speed matters Short shaft work within 500 mm (19.69 in) of turning length Shops buying for build quality and control rather than headline specifications

Frequently Asked Questions

01 What size part does the GENOS L400II turn?

Maximum turning diameter is 330 mm (12.99 in) and maximum turning length is 500 mm (19.69 in). The diameter figure is the one to plan against regardless of what the model designation suggests — it places the machine in the mid-size chucking class rather than the large-swing class.

02 Can the L400II handle long shaft work?

Not really. Maximum turning length is 500 mm (19.69 in), which pairs sensibly with the 330 mm diameter because parts in that diameter range are usually short relative to their diameter. Longer shaft production needs a machine with a longer bed.

03 Why does the spindle only reach 3,000 min⁻¹?

Because at 330 mm diameter the surface speed at the outside of the part is already high, so a higher ceiling would add little. The more useful end of the range is the 30 min⁻¹ minimum, which is what allows heavy facing and boring at large diameters where cutting speed must come down and torque carries the cut.

04 Is the L400II powerful enough for sustained roughing?

It is moderate. The spindle motor is rated 11 kW (15 hp) at the 30-minute rating and 7.5 kW (10 hp) continuous. Shops planning sustained roughing in tough alloys should size depth of cut against the 7.5 kW continuous figure rather than the short-duty peak.

05 Why does the JIS A2-8 spindle nose matter?

On a machine of this size it is one of the more significant specifications. An A2-8 nose is a larger and stiffer mount than smaller turning centers carry, so the machine will hold a heavy chuck and absorb the overhung load of a large-diameter workpiece without the spindle mounting becoming the weak point in the cut.