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Okuma Howa Lathe Repair & Support
Diagnostics and repair for Okuma & Howa co-branded CNC lathes — a joint-venture line that shipped with FANUC controls rather than Okuma’s own OSP system.
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What Are Okuma & Howa Lathes?
The Howa-Okuma lathes were a joint-venture product line built in partnership with Howa Machinery, badged “Okuma & Howa” and produced from the late 1980s through the late 1990s. What genuinely sets this line apart from every other legacy Okuma platform we support is the control: rather than Okuma’s own OSP system, Howa-Okuma machines commonly shipped with FANUC controls — the 18T series or the earlier Series O-T — making this the one Okuma-badged legacy line where FANUC control expertise, not OSP expertise, is the relevant repair skill set. It’s a genuine outlier in an otherwise OSP-consistent legacy lineup, and worth flagging clearly before any repair conversation starts.
The lineup spanned genuine variety in configuration. The ACT series (ACT-3, ACT-4, ACT-20, ACT-35) covers single-spindle turning centers scaling from compact machines with roughly 18-inch swing up to larger units with 21-inch-plus swing and 30 HP spindle motors. The 2SP series added twin-spindle capability (2SP-35H) for simultaneous or sequential machining across two spindles, while the 2SP-V3 brought that twin-spindle concept to a vertical turning center configuration — a genuinely different mechanical layout from the horizontal ACT machines.
Okuma marketed these machines toward automotive, aerospace, and general metalworking applications, and a meaningful number are still running in shops today — mechanically robust enough to outlast several control-technology generations, even as the FANUC controls they shipped with have themselves become a legacy repair specialty.
Howa-Okuma Models & Specifications
The range spans single-spindle ACT machines through twin-spindle horizontal and vertical configurations.
ACT-3 / ACT-4
- Swing over bed: ~18.3-21.25 in
- Max. turning diameter: ~8.35-15.35 in
- Spindle: 15-30 HP
- ACT-4: 2-range spindle (35-1050/35-3500 RPM)
ACT-20 / ACT-35
- Swing over bed: ~19.68 in and larger
- Max. turning diameter: ~13.7 in
- Spindle: 25 HP, up to 3,500 RPM
- 12″ chuck, A2-8 spindle nose
2SP-35H (Twin-Spindle)
- Two 12-position turrets
- Max. cutting diameter: ~14.96 in
- Spindle: 25 HP, 35-3,500 RPM
- Distance between spindles: ~17.72 in
2SP-V3 (Vertical Twin-Spindle)
- Vertical turning center configuration
- Max. swing per spindle: ~19.68 in
- Genuinely different layout from ACT/2SP-H machines
Because this platform genuinely differs in control brand — FANUC rather than OSP — confirming the exact FANUC control series (18T vs. Series O-T) matters as much as identifying the mechanical model before ordering any control-related parts.
Which Control Does the Howa-Okuma Line Use?
Unlike every other Okuma legacy platform we cover, Howa-Okuma lathes commonly run FANUC controls — the 18T series on later machines, and the earlier FANUC Series O-T on earlier units. This is a genuinely different repair specialty from OSP-based Okuma machines, and we approach diagnosis and board-level repair on these controls with FANUC-specific expertise rather than treating them as an OSP variant.
Given how these machines blend Okuma mechanical engineering with FANUC control electronics, confirming the exact control series and revision is one of the most important first steps — FANUC 18T and Series O-T controls differ substantially in both hardware and available diagnostic approaches.
Common Howa-Okuma Faults We Repair
The Howa-Okuma line’s FANUC control base and twin-spindle variants create a fault profile genuinely distinct from OSP-based Okuma legacy lathes.
FANUC 18T / Series O-T control faults
Board-level faults on these FANUC controls follow FANUC-specific diagnostic and repair patterns rather than OSP patterns — we approach these with dedicated FANUC control expertise, including the older Series O-T units that predate the 18T generation.
Twin-spindle synchronization faults (2SP models)
On 2SP-35H and 2SP-V3 machines, faults affecting only coordinated operation between the two spindles — while each spindle works fine independently — point toward the control’s synchronization logic rather than either spindle drive individually.
Two-range spindle gear faults (ACT-4)
On ACT-4 machines with a mechanical 2-range spindle (low 35-1,050 RPM, high 35-3,500 RPM), faults affecting only one range while the other works normally point toward that specific gear range’s mechanical engagement rather than the spindle drive electronics.
Turret faults (drum vs. bi-directional)
Different ACT models use different turret mechanisms — drum-type or bi-directional — so confirming which type is fitted before diagnosing an indexing fault matters, since the two mechanisms fail in different ways.
Display and operator panel faults
FANUC-specific display and panel repair patterns apply here, distinct from the OSP-generation displays found on other legacy Okuma platforms.
Given the FANUC control base and configuration variety on this platform, we confirm the exact model, control series and revision before isolating any failing component. See our fault analysis and retrofit & modernization services for more on our approach.
Components We Repair on Howa-Okuma Lathes
Given this platform’s FANUC control base and configuration variety, these are the parts we’re asked to repair most often:
Spindles
Single and twin-spindle drive diagnosis and repair.
Control Boards
FANUC 18T and Series O-T board-level repair.
Servo & Spindle Drives
FANUC-compatible drive electronics repair.
Twin-Spindle Sync System
Synchronization logic and coordination repair (2SP models).
Drum & Bi-Directional Turrets
Turret indexing repair, by mechanism type.
Operator Panels & Displays
FANUC-specific display and panel repair.
Howa-Okuma Repair Services
The following services apply directly to Howa-Okuma machines, whatever the fault:
FANUC Control Repair
Board-level repair for FANUC 18T and Series O-T controls.
Drive Units Repair
Component-level repair of spindle and axis drive electronics.
Testing & Diagnostics
Control-series identification before repair begins.
Spindle Repair & Maintenance
Service across single and twin-spindle configurations.
Emergency & Express Repair
Priority turnaround with loaner units to minimize downtime.
Retrofit & Modernization
Upgrade path for machines still on Series O-T controls.
Industries That Rely on Howa-Okuma Lathes
Its combination of mechanical reliability and configuration variety suits:
Where We Support Howa-Okuma Machines
CNC Elektronik is based in Germany, where job shops still running well-maintained Howa-Okuma lathes rely on our FANUC control expertise for this specific platform.
We’ve also supported Howa-Okuma repair work in Austria and the Czech Republic, where automotive and general manufacturing shops commonly run these mechanically robust legacy machines, as well as in Brazil, where Howa-Okuma lathes remain in service across general machining operations. The process is the same regardless of distance: confirm the exact model, control series and configuration, isolate the failing component, and verify the machine’s accuracy before it returns to production. Because so few shops today maintain both OSP and FANUC repair expertise, we treat this platform as a specialty rather than a generic legacy repair.
See our Countries We Serve page for our full regional coverage across Europe, the Americas, and parts of Asia and the Middle East.
Explore More Resources
Howa-Okuma lathes are one part of a much wider Okuma ecosystem. Here’s where to go next:
All Okuma Models
Browse every Okuma machine series and model we repair.
OSP Controls
OSP control generations we diagnose and repair.
2SP Series (Current)
Okuma’s current-generation twin-spindle lathe line.
Spare Parts
New and used electronics spare parts, tested before sale.
Countries We Serve
Where our repair and support coverage extends to.
Frequently Asked Questions
The Howa-Okuma line was a joint venture with Howa Machinery, and unlike Okuma’s own model lines, these machines commonly shipped with FANUC control systems rather than Okuma’s OSP control — a deliberate choice for this specific product line.
ACT models are single-spindle turning centers. 2SP models add a second spindle for twin-spindle production, either in a horizontal (2SP-35H) or vertical (2SP-V3) configuration.
Check the machine’s nameplate for the model designation and the control cabinet for the FANUC series. Send us photos if you’re unsure, and we’ll confirm it.
Yes. While most of our work is on Okuma’s own OSP controls, the Howa-Okuma line specifically requires FANUC control expertise, which we maintain for exactly this platform.
In most cases, yes. These machines are known for mechanical robustness, and component-level repair of a control board or drive is typically far cheaper than a full replacement.
Have a Howa-Okuma Issue?
Send us your model, control series and a description of the fault — we’ll get back to you with a practical assessment.
