Fortuna spindle and motor spindle repair
Brochexpress is an independent workshop specialising in the repair, maintenance and diagnostics of Fortuna spindles and motor spindles — the historic German manufacturer of cylindrical and crankshaft grinding machines (Fischer Fortuna GmbH), many of whose machines remain in service today.
Fortuna Werke, the historic German manufacturer of cylindrical grinding
TLDR: Fortuna Werke, today Fischer Fortuna GmbH, is a historic German manufacturer of cylindrical and crankshaft grinding machines, many of which, installed as early as the 1940s and 1950s, remain in service today in engineering and engine rebuilding workshops across Europe.
Fortuna Werke, continued today under the name Fischer Fortuna GmbH, built a solid reputation in the manufacture of cylindrical and crankshaft grinding machines, with historic models (SE series, notably SE300 and SE450) of which some examples, installed as early as the 1940s and 1950s, are still in service today — a testament to the robustness of the manufacturer design. These machines cover conventional external cylindrical grinding as well as internal grinding (through a specific interchangeable spindle head), and crankshaft grinding for engine rebuilding, a segment where Fortuna remains a reference sought after by specialists rebuilding both classic and modern engines.
A range of interchangeable two-speed spindles for external and internal grinding
TLDR: Fortuna grinding machines use a two-speed grinding wheel spindle (speed changed by swapping the pulley set according to wheel diameter), with an additional interchangeable spindle head for internal grinding, reaching 35,000 rpm, and a workhead spindle with several fixed speeds.
On Fortuna cylindrical grinding machines, the grinding wheel spindle has two speeds depending on the diameter of the wheel used, the speed change being made by swapping the pulley set. For internal grinding, a complete and specific spindle head must be fitted in place of the external grinding head — a dedicated electrical socket at the rear of the machine supplies this additional spindle, while the same front panel control is retained. These internal grinding spindles, of the Fortuna SJ type, can reach very high rotation speeds (up to 35,000 rpm on certain dressing accessories). The workhead spindle, for its part, typically runs at several selectable fixed speeds (25, 65, 155, 400 rpm on common configurations), with manual swivelling for machining tapered or eccentric bearing surfaces, notably on crankshafts.
Fortuna spindles and motor spindles covered (non-exhaustive list)
- Grinding wheel spindles with two speeds by pulley change
- Interchangeable spindle heads for internal grinding, SJ type
- Workhead spindles with several fixed speeds (cylindrical and crankshaft grinding)
- Spindles of wheel dressing accessories, up to 35,000 rpm
- Spindles of historic SE series grinders (SE300, SE450) and more recent industrial models
Interfaces and specifications
The Fortuna spindles and motor spindles we repair cover rotation speeds from **25 rpm** (workhead spindle, slow grinding) up to **35,000 rpm** on internal grinding spindles and dressing accessories — exact specifications to be confirmed on quotation according to the reference of your machine.
Our expertise on your Fortuna spindles and motor spindles
TLDR: Brochexpress works across the entire life cycle of your Fortuna spindles and motor 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 grinding line
Full diagnostics
- Inspection of clearances, balancing, bearing condition, sealing and the pulley change system, with a detailed technical report
Preventive and corrective maintenance
- Maintenance programme tailored to the precision requirements of cylindrical grinding and engine rebuilding, 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 Fortuna spindles and motor spindles
- An independent workshop, with no capital ties to manufacturers, guaranteeing an objective diagnosis
- Expertise in interchangeable internal and external grinding spindles, including on historic machines
- 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 the spindles of historic Fortuna grinders (SE series) still in service?
Yes, we work on these spindles whatever the age of the machine — valuable know-how for this fleet of robust machines still in use.
Do you work on interchangeable internal grinding spindle heads, SJ type?
Yes, we diagnose and repair these spindles, up to their highest rotation speeds.
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 workhead spindles of Fortuna crankshaft grinders?
Yes, we diagnose and repair these spindles, whatever the speed range selected.
Do you offer a preventive maintenance contract for a fleet of Fortuna machines?
Yes, we set up preventive maintenance programmes tailored to your production rate.
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 Fortuna spindles and motor spindles — spindles and motor spindles of cylindrical and crankshaft grinding machines — with the responsiveness and rigour demanded by the most exacting industrial environments.
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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Fortuna® is a registered trademark of Fischer Fortuna GmbH. Brochexpress is neither affiliated with, nor a partner of, nor an authorised distributor of Fischer Fortuna 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).