Mitsubishi GA26 CNC Gear Hobbing Machine
Key Specifications
Maximum Workpiece Diameter
Maximum Module
Maximum Face Width
Hob Speed
Workpiece Speed
Number of Axes
Overview
The Mitsubishi GA26 is a high-speed CNC gear hobbing machine from Mitsubishi Heavy Industries' Machine Tool Division, designed for the production of automotive transmission gears, differential gears, and general powertrain components. The GA26 hobbing center accommodates workpieces up to 260 mm in diameter and module up to 4, targeting the precision automotive gear market where cycle times and DIN 5 quality are required in volume production. The machine features a direct-drive hob spindle without belt or gearbox drive, eliminating harmonic error and enabling dry hobbing with coated PM-HSS or carbide hobs. Mitsubishi's proprietary NC controller, the M70V series, offers gear-specific conversational programming and automatic calculation of differential gear ratios for helical gearing. Integrated workpiece loading and gauging interfaces prepare the GA26 for automation cell integration with collaborative robots or gantry loaders. The machine is produced in Japan and backed by Mitsubishi's global machine tool service organization.
Full Specifications
| Parameter | Value |
|---|---|
| Maximum Workpiece Diameter | 260 mm (10.2 in) |
| Maximum Module | 4 |
| Maximum Face Width | 200 mm (7.9 in) |
| Hob Speed | Up to 5,000 RPM |
| Workpiece Speed | Up to 1,200 RPM |
| Number Of Axes | 6 CNC axes |
| Drive | Direct-drive hob spindle |
| Gear Quality | DIN 5 (ISO Grade 5) |
| Dry Hobbing | Standard |
| Control | Mitsubishi M70V |
| Manufacturer | Mitsubishi |
| Model | GC40 |
Specifications sourced from machinio.com — verified 2026-03-28
Strengths & Limitations
Strengths
- Direct-drive hob spindle eliminates gear error from belt-drive transmission
- Dry hobbing standard — no cutting fluid system required
- Mitsubishi M70V controller offers gear-specific conversational programming
- Japanese build quality with global Mitsubishi service network
- Automation-ready with robot and gantry loader integration
Limitations
- 260 mm diameter limits to smaller automotive and powertrain gears
- High price vs some Korean and Taiwanese alternatives for similar capability
- Dry hobbing chip evacuation requires careful system design for lights-out production
- M70V controller has limited English-language documentation availability
Best For
Frequently Asked Questions
01
The GA26 is optimized for spur and helical gear hobbing. Worm gear hobbing is possible but requires specialized setup; Mitsubishi offers dedicated worm gear hobbing models in their GH series.
02
The GA26 accepts hobs from 80 mm to 160 mm in diameter. Hob length up to 200 mm is supported with standard arbor configurations.
03
The GA26 is designed for dedicated hob production. Hob change is manual, using the machine's built-in arbor and alignment aids. Automatic hob changers are available on higher-end models in the GA series.
Community Discussions
Community discussion — CNCzone.com- Largest Forums for CNC Professional and Hobbyist ...
Community discussion — gear hobbing.... - CNCzone
Electrical and installation requirements — Need Help! Mitsubishi Gear Hobbing NC Unit files Required.
Troubleshooting and problem-solving — Gear hobbing - cnczone.com
Pricing and buying discussion — gear hobbing : r/Machinists - RedditAnyone hobbing gears? : r/machining - RedditMachining - Reddithas anyone created a diy cnc gear hobbing machine?How difficult is gear making? : r/Machinists - RedditBuying a used CNC : r/Machinists - RedditWhat does everyone see as
Community discussion — Anyone hobbing gears? : r/machining - Reddit
Community discussion — has anyone created a diy cnc gear hobbing machine?
Community discussion — How difficult is gear making? : r/Machinists - Reddit
Links to community discussions. Summaries are editorial — visit the original thread for full context.
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