Okuma V920EX

$300,000 - $450,000 Updated 2026-03-13

Key Specifications

Max Spindle

min⁻¹

Rapid Traverse

Spindle Power

30/22

max turning diameter

420 mm (16.5 in)

max turning height

250 mm (9.8 in)

spindle torque

300 Nm (221 ft-lb)

Overview

The Okuma V920EX is a single-spindle inverted vertical CNC lathe built for high-production turning of medium-to-large disc-shaped parts. With a maximum turning diameter of 420 mm (16.5 in) and a maximum turning height of 250 mm (9.8 in), it handles components that exceed the capacity of the smaller V760EX series while maintaining the inverted-spindle architecture that defines Okuma's vertical turning lineup.

The inverted spindle picks up raw blanks from a conveyor or staging area, machines them in the cutting zone, and deposits finished parts automatically. This pick-and-place cycle eliminates the need for a separate robot loader in many applications. The spindle delivers 22/18.5 kW (30/25 hp) at up to 2,500 RPM with 300 Nm (221 ft-lb) of torque, providing enough muscle for roughing cast iron brake rotors, steel hubs, and alloy steel gear blanks in a single chucking.

The 12-station VDI 50 turret handles both OD and ID turning tools with rigidity to match the machine's cutting envelope. Optional driven tools add cross-drilling and tapping capability without a second operation. X-axis travel is 280 mm (11.0 in) and Z-axis travel is 350 mm (13.8 in), with rapid traverse at 30 m/min on both axes.

Okuma's Thermo-Friendly Concept maintains spindle and structure thermal compensation continuously, which matters on a machine running three shifts of cast iron or steel turning where thermal growth can drift tolerances. The OSP-P300L control includes Collision Avoidance System to protect the inverted spindle configuration during setup and tool prove-out.

The V920EX is purpose-built for automotive and heavy equipment production lines. It competes with the Emag VL 6, Fuji CSD-400, and Scherer VDZ 420. Machine weight is approximately 9,800 kg (21,605 lb). Floor space is 3,100 x 2,800 mm. New pricing runs $300,000-$450,000 depending on configuration and automation options. Shops producing large brake rotors, truck hubs, and flanged components at volumes above 100,000 per year are the primary buyers.

Full Specifications

Parameter	Value
Max Turning Diameter	420 mm (16.5 in)
Max Turning Height	250 mm (9.8 in)
Max Spindle Speed	min⁻¹
Spindle Motor Power	30/22
Spindle Torque	300 Nm (221 ft-lb)
Spindle Type	Inverted vertical
Chuck Size	315 mm (12.4 in) hydraulic
Turret Type	VDI 50, 12-station
X Axis Travel	280 mm (11.0 in)
Z Axis Travel	350 mm (13.8 in)
Rapid Traverse Rate	24
Machine Weight	9,800 kg (21,605 lb)
Floor Space	3,100 x 2,800 mm (122 x 110 in)
CNC Control	Okuma OSP-P300L
Max Cutting Diameter	Ø920
Max Cutting Length	860
Swing Over Bed	mm
Okuma Global Repair Center	Charlotte, North Carolina
Inches	Metric
Max Swing	Ø1,000
Spindle Speed	20~1,250

Specifications sourced from okuma.com — verified 2026-03-28

Strengths & Limitations

Strengths

Inverted spindle architecture with integrated pick-and-place eliminates the need for a separate robot loader in many production applications
420 mm turning diameter handles larger disc parts like truck brake rotors and heavy equipment hubs that exceed smaller V760EX capacity
VDI 50 turret provides heavy-duty rigidity for roughing cast iron and steel at the cutting forces this size class demands
Thermo-Friendly Concept maintains accuracy across three-shift production without manual offset compensation between shifts
Gravity-assisted chip evacuation from the inverted spindle keeps the cutting zone clean and extends tool life on cast iron work
Collision Avoidance System protects the inverted spindle configuration during setup and new-part prove-out

Limitations

Single-spindle configuration means OP10 and OP20 require either two machines in line or a flip station, unlike the twin-spindle 2SP series
2,500 RPM maximum spindle speed limits surface footage on smaller-diameter aluminum parts where higher speeds would be beneficial
OSP control is Okuma-proprietary with no Fanuc or Siemens option, which can complicate integration into mixed-brand production lines
Purpose-built for disc parts and not suitable for shaft work or complex geometries requiring tailstock support

Best For

Automotive and truck component manufacturers producing brake rotors, hubs, and flanged parts at 100,000+ per year Heavy equipment producers turning large disc-shaped components in cast iron and steel up to 420 mm diameter Production lines needing integrated automation without the cost and complexity of a separate robot cell Shops replacing older vertical lathes where Thermo-Friendly Concept will eliminate manual offset adjustments across shifts High-volume facilities pairing V920EX machines in OP10/OP20 configurations with conveyor linking

Frequently Asked Questions

01 What does an Okuma V920EX cost?

A new V920EX typically runs $300,000-$450,000 depending on driven tool options, automation peripherals, and conveyor configuration. The inverted spindle with integrated pick-and-place reduces total cell cost compared to a conventional vertical lathe plus robot loader.

02 What is the difference between the V920EX and the 2SP-V760EX?

The V920EX is a single-spindle machine with a larger 420 mm turning diameter, while the 2SP-V760EX is a twin-spindle machine limited to 300 mm diameter. The 2SP runs OP10 and OP20 simultaneously for higher throughput on smaller parts. The V920EX is better for larger components that exceed the 2SP's capacity.

03 How does the inverted spindle design benefit production?

The inverted spindle picks up workpieces from below, machines them, and deposits finished parts automatically. Gravity assists chip evacuation away from the cutting zone, reducing chip recutting and improving surface finish. The pick-and-place function eliminates the need for a separate robot loader in many applications.

04 Can the V920EX handle cast iron brake rotors?

Yes, the V920EX is specifically designed for this application. The 22 kW spindle with 300 Nm torque provides ample cutting force for roughing and finishing cast iron. The inverted spindle design keeps graphite-laden cast iron chips clear of the cutting zone, and Thermo-Friendly Concept maintains tolerances across long production runs.

05 What control does the V920EX use?

The V920EX runs Okuma's OSP-P300L control with integrated Thermo-Friendly Concept and Collision Avoidance System. The control manages the spindle, turret, and integrated pick-and-place automation from a single interface.