Kern Microtechnik spindle and motor spindle repair
Brochexpress is an independent workshop specializing in the repair, maintenance and diagnostics of Kern Microtechnik motor spindles — a leading German manufacturer in ultra-precision micro-machining, renowned for its 5-axis machining centres dedicated to watchmaking, optics, medical and dental applications.
Kern Microtechnik, Bavarian reference in nanometric micro-machining
TLDR: Kern Microtechnik (Eschenlohe, Bavaria, over 60 years of experience) designs compact CNC precision machining centres, renowned worldwide for their precision in the nanometric range and their long-term reliability, intended for both series micro-machining and prototype manufacturing.
For over 60 years, Kern Microtechnik has developed and manufactured, in Eschenlohe, CNC precision machining centres for high-productivity micro-machining in 5 simultaneous axes. The Kern Micro platform, available in several versions (Pro, Vario, HD), forms the core of the manufacturer's range, with a minimal footprint (less than 4 m²) and positioning accuracy of around half a micron. The Micro HD centre, dedicated to machining difficult materials such as hardened steel and technical ceramics, combines coordinate grinding and ductile milling on a single machine, allowing grinding and finish milling to be carried out without re-clamping the workpiece.
A range of very-high-speed motor spindles for precision micro-machining
TLDR: Kern machining centres integrate very-high-speed motor spindles (up to 50,000 rpm) with an HSK 25 or HSK-E40 interface, with active thermal management ensuring positioning accuracy of around ±0.5 µm and surface finishes of Ra ≤ 0.1 µm.
Kern Micro and Evo machining centres are fitted with very-high-speed motor spindles, available depending on the model at 30,000, 32,000, 40,000, 42,000 or 50,000 rpm, with power ratings ranging from 6 to 15 kW. These spindles benefit from the manufacturer's own active thermal management system, keeping the temperature of critical components (spindle, motors, linear guides) constant to avoid any thermal deformation likely to compromise machining accuracy. On models dedicated to machining hard materials, the CSC (Ceramic Speed Cutting) spindle makes it possible to combine grinding and ductile milling with high resistance to abrasive wear.
Kern Microtechnik spindles covered (non-exhaustive list)
- HSK 25 motor spindles, up to 50,000 rpm, Evo range
- HSK-E40 motor spindles, 30,000 to 42,000 rpm, Micro Pro and Vario range
- CSC motor spindles dedicated to grinding and ductile milling of ceramics, Micro HD range
- Spindles with active thermal management, the manufacturer's own cooling system
- Spindles for 5-axis dental and medical machining centres
Your model is not listed? Contact us for confirmation.
Interfaces and specifications
The Kern Microtechnik motor spindles we repair come mainly with HSK 25 and HSK-E40 interfaces, with rotation speeds typically between 30,000 and 50,000 rpm depending on the model, for power ratings of 6 to 15 kW.
Our expertise on your Kern Microtechnik motor spindles
Brochexpress works across the entire life cycle of your Kern spindles, with the same rigour as on the other brands in our portfolio.
On-site customer service
- Diagnostics and service directly on your machine, in your production workshop, to limit downtime on very-high-value equipment
Full diagnostics
- Inspection of clearances, balancing, bearing condition, sealing and Kern's own active thermal management system, with a detailed technical report
Preventive and corrective maintenance
- A servicing programme tailored to the nanometric precision requirements of series micro-machining, as well as corrective work in the event of a breakdown
Overhaul and refurbishment
- Grinding, bearing replacement, reworking of the sealing and workshop rotation testing, restoring the manufacturer's original tolerances
Why choose Brochexpress for your Kern Microtechnik motor spindles
No capital ties with manufacturers, guaranteeing an objective diagnosis
Expertise in very-high-speed motor spindles and active thermal management systems
Beaurepaire (France) and Lussery-Villars (Switzerland)
From the first intervention through to 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 the CSC motor spindles dedicated to grinding and ductile milling?
Yes, we work on these spindles, taking into account their specific requirements for resistance to the abrasive wear inherent in ceramic machining.
Do you work on HSK 25 motor spindles at 50,000 rpm?
Yes, we diagnose and repair these very-high-speed spindles, taking care to preserve their submicron positioning accuracy.
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 the parts specific to these precision technologies.
Can a repair affect the nanometric precision guaranteed by Kern?
Our overhaul process aims to restore the manufacturer's original tolerances, with particular care given to balancing and bearing clearances, which are essential on this type of spindle.
Do you offer a preventive maintenance contract for a fleet of Kern Microtechnik machines?
Yes, we set up preventive maintenance programmes tailored to the criticality of this equipment, particularly relevant for micro-machining workshops in continuous production.
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 Kern Microtechnik range — motor spindles for ultra-precision micro-technology machining centres — with the responsiveness and rigour demanded by the most exacting industrial environments: watchmaking, optics, medical and dental.
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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Kern Microtechnik® is a registered trademark of Kern Microtechnik GmbH. Brochexpress is neither affiliated with, nor a partner of, nor an authorised distributor of Kern Microtechnik GmbH. 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).