Okamoto grinding spindle repair
Brochexpress is an independent workshop specialising in the repair, maintenance and diagnostics of Okamoto grinding spindles. We work from our sites in Beaurepaire (France, Auvergne-Rhône-Alpes) and Lussery-Villars (Switzerland) alongside precision grinding manufacturers.
Brochexpress is an independent workshop specialising in the repair, maintenance and diagnostics of Okamoto grinding spindles — a Japanese manufacturer with its own foundry, a benchmark in high-precision surface and internal/external cylindrical grinding.
Okamoto, a Japanese manufacturer integrated from foundry to spindle
TLDR: Okamoto Machine Tool Works (Japan, with a European subsidiary in Langen) is one of the few grinding machine manufacturers to operate its own foundry and to design its own spindles, with nearly 96% of its machines' components coming from its own production.
Okamoto offers one of the widest and most diverse ranges of grinding machines on the market, covering surface grinding, internal and external cylindrical grinding, profile grinding, as well as dedicated solutions for wafer processing for the electronics industry. The manufacturer stands out for a level of vertical integration that is rare in the sector: it operates its own foundry, both for the manufacture of its own machines and for other high-end manufacturers, and designs the spindles fitted to its grinders itself. True to a Japanese artisanal tradition, Okamoto uses hand scraping on its slideways to create perfect oil pockets, guaranteeing superior flatness and guiding precision over the long term.
A range of grinding spindles, from surface to high-frequency internal
TLDR: Okamoto spindles cover a very broad spectrum: surface grinding spindles (2,500 to 3,600 rpm), external cylindrical grinding spindles (up to 500 rpm for large workpieces), and high-frequency internal grinding spindles reaching up to 60,000 rpm.
Okamoto surface grinders, such as the ACC-CAiQ series, feature continuously variable grinding spindles, with power ratings from 2.2 to 7.5 kW and speeds typically between 2,500 and 3,600 rpm, combined with hand-scraped twin V slideways. The IGM series internal cylindrical grinders stand out with configurations featuring one or two spindles movable independently of each other, spindle speeds from 6,000 to 60,000 rpm depending on the configuration, a choice of direct-drive high-frequency spindles available as an option, and a "Boxer" spindle arrangement that facilitates set-up without interference between the spindle and the workpiece. On CNC universal cylindrical grinders, the spindle is driven with continuously variable speed, with grinding speeds of up to 45 m/s at the wheel periphery.
Okamoto grinding spindles covered (non-exhaustive list)
- Continuously variable surface grinding spindles, ACC-CAiQ series
- High-frequency internal cylindrical grinding spindles, up to 60,000 rpm
- Independently movable twin spindles, IGM series
- CNC universal cylindrical grinding spindles with B-axis
- Profile and complex contour grinding spindles
Your model is not listed? Contact us for confirmation.
Interfaces and specifications
The Okamoto grinding spindles we repair cover a wide speed range depending on the application: from 2,500 to 3,600 rpm in surface grinding, and from 6,000 to 60,000 rpm in internal cylindrical grinding depending on the configuration — specifications to be confirmed on quotation according to the exact reference of your machine.
Our expertise on your Okamoto grinding spindles
TLDR: Brochexpress works across the entire life cycle of your Okamoto spindles, with the same rigour as on the other brands in our portfolio.
On-site customer service
- Diagnostics and intervention directly on your machine, in the production workshop
- Limiting downtime on very high added-value equipment
Full diagnostics
- Inspection of clearances, balancing, bearing condition and sealing
- Inspection of independent twin-spindle systems
- Detailed technical report
Preventive and corrective maintenance
- Maintenance programme tailored to the precision requirements specific to surface and cylindrical grinding
- Corrective interventions in the event of a breakdown
Overhaul and refurbishment
- Grinding, bearing replacement, seal refurbishment
- Rotation testing in the workshop
- Restoration of the manufacturer's original tolerances
Why choose Brochexpress for your Okamoto grinding spindles
No capital ties with any manufacturer, guaranteeing an objective diagnosis
Expertise on surface grinding spindles as well as high-frequency internal spindles
Two service sites: Beaurepaire (France) and Lussery-Villars (Switzerland)
Support from the first intervention through to the return to production
Lead times and warranty
- On-site service within 48h
- Workshop repair: around 20 working days depending on parts availability
- 12-month warranty on all our repairs
Frequently asked questions
Do you repair high-frequency internal grinding spindles (up to 60,000 rpm)?
Yes, we work on these spindles, taking into account their specific precision and balancing requirements at very high speed.
Do you work on configurations with two independently movable spindles (IGM series)?
Yes, we diagnose and repair each of the two spindles in these configurations.
What is the average lead time for a full overhaul?
Allow around 20 working days in the workshop, depending on the condition of the spindle and the availability of parts specific to these precision technologies.
Do you work on continuously variable surface grinding spindles?
Yes, we diagnose and repair these spindles, whatever the configured power or speed.
Do you offer a preventive maintenance contract for a fleet of Okamoto machines?
Yes, we draw up preventive maintenance programmes tailored to the criticality of this equipment, particularly relevant for precision grinding workshops.
A reliable partner for your industrial performance
Whether it is an emergency on-site intervention, a full workshop overhaul or a preventive maintenance programme, Brochexpress brings its expertise to your production. As an independent workshop, we work across the entire Okamoto range — surface and internal/external cylindrical grinding spindles — with the responsiveness and rigour demanded by the most exacting industrial environments: aerospace, automotive, medical and tooling.
Our teams are at your disposal from our sites in Beaurepaire (France) and Lussery-Villars (Switzerland) for a study of your needs, a diagnosis or a personalised quotation.
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Okamoto® is a registered trademark of Okamoto Machine Tool Works, Ltd. Brochexpress is neither affiliated with, nor a partner of, nor an authorised distributor of Okamoto Machine Tool Works, Ltd. Our business covers independent repair and maintenance of industrial equipment, permitted under the principle of referential trademark use (EU Trademark Directive 2015/2436 / French Intellectual Property Code, art. L.713-6).