Erwin Junker spindle and motor spindle repair
Brochexpress is an independent workshop specialising in the repair, maintenance and diagnostics of Erwin Junker spindles and motor spindles — the German builder of high-output cylindrical grinders, a world benchmark in automotive and aerospace grinding.
Erwin Junker, the German benchmark in high-output cylindrical grinding
TLDR: Erwin Junker Maschinenfabrik GmbH (Germany) develops, produces and distributes high-productivity cylindrical grinders, with innovative concepts such as GRINDSTAR (plunge grinding replacing turning), JUCRANK (crankshaft grinding up to 10 metres) and QUICKPOINT (compact CNC cylindrical grinding).
The Junker group develops, produces and distributes cylindrical grinders for high-output sectors such as automotive. The GRINDSTAR concept replaces turning with high-speed plunge grinding without dressing, with a process up to three times faster and availability above 96%, delivering surface qualities down to Rz 2 µm on both soft and hard applications. The JUCRANK 8 grinder can measure up to ten metres long and grind large forged crankshafts in a single clamping, thanks to a WK axis refined by Junker.
A range of internal grinding spindles and swivelling wheel spindles
TLDR: Junker grinders use internal grinding spindles reaching 16,000 to 25,000 rpm, with a workpiece spindle running from 22 to 750 rpm, and a wheel spindle that swivels on the WK axis to compensate taper errors during grinding.
On Junker CNC cylindrical grinders such as the BUAJ series, the workpiece spindle typically runs from 22 to 750 rpm, with a wheel spindle whose bore can reach 127 mm for wheel diameters of 400 mm and peripheral speeds of 45 m/s. On the most advanced configurations, two separate internal grinding spindles can be fitted to the same machine, one running at 16,000 rpm, the other at 25,000 rpm, to suit different bore diameters. On the JUCRANK 8 grinder, the wheel spindle works with the patented WK axis, able to swivel during grinding.
Erwin Junker spindles covered (non-exhaustive list)
- Internal grinding spindles, up to 25,000 rpm
- Workpiece spindles, 22 to 750 rpm, BUAJ series
- Wheel spindles swivelling on the WK axis, JUCRANK crankshaft grinding
- Plunge grinding spindles without dressing, GRINDSTAR concept
- Spindles of compact QUICKPOINT grinders
Interfaces and specifications
The Erwin Junker spindles and motor spindles we repair cover rotation speeds from 22 to 750 rpm for the workpiece spindle, up to 25,000 rpm for internal grinding spindles — exact specifications to be confirmed on quotation according to the reference of your machine.
Our expertise on your Erwin Junker spindles and motor spindles
TLDR: Brochexpress works across the entire life cycle of your Erwin Junker spindles, with the same rigour as for 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 your automotive grinding line
Full diagnostics
- Inspection of clearances, balancing, bearing condition, sealing and the swivelling WK axis system, with a detailed technical report
Preventive and corrective maintenance
- Maintenance programme tailored to the very high production rates of the automotive sector, together with corrective action in the event of a breakdown
Overhaul and refurbishment
- Grinding, bearing replacement, sealing refurbishment and rotation testing in the workshop, restoring the manufacturer's original tolerances
Why choose Brochexpress for your Erwin Junker spindles and motor spindles
- An independent workshop, with no capital ties to manufacturers, guaranteeing an objective diagnosis
- Expertise in internal grinding spindles and wheel spindles swivelling on the WK axis
- Two service sites: Beaurepaire (France) and Lussery-Villars (Switzerland)
- Support from the first intervention through to return to production
Turnaround 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 internal grinding spindles (up to 25,000 rpm)?
Yes, we work on these spindles, whatever the configured rotation speed.
Do you work on the WK-axis swivelling wheel spindles of JUCRANK grinders?
Yes, we diagnose and repair these spindles, taking into account their taper compensation system.
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 (bearings, seals, specific components).
Do you work on the spindles of compact QUICKPOINT grinders?
Yes, we diagnose and repair these spindles, whatever the machine configuration.
Do you offer a preventive maintenance contract for a fleet of Erwin Junker machines?
Yes, we draw up preventive maintenance programmes tailored to your production pace, particularly relevant for automotive.
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 all Erwin Junker spindles and motor spindles — high-output cylindrical grinders — with the responsiveness and rigour demanded by the most exacting industrial environments: automotive and aerospace.
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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Erwin Junker® is a registered trademark of Erwin Junker Maschinenfabrik GmbH. Brochexpress is neither affiliated with, nor a partner of, nor an authorised distributor of Erwin Junker Maschinenfabrik 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).