Union boring machine spindle repair
Brochexpress is an independent workshop specialising in the repair, maintenance and diagnostics of Union horizontal boring machine spindles — a historic German heavy-engineering manufacturer and a reference for machining very large, heavy workpieces.
Union, the German reference for heavy-duty horizontal boring machines
TLDR: Union is a German manufacturer specialising in horizontal boring-milling machines with a moving column for machining large, heavy workpieces, with machines capable of handling parts up to 10 metres high, 40 metres long and 250 tonnes.
Union has built a solid reputation for designing horizontal boring-milling machines dedicated to machining workpieces of very large dimensions and considerable mass. The PR 200/250 series, presented as a major evolution of the range, illustrates this specialisation: designed to machine parts up to 10 metres high, 40 metres long and 250 tonnes — or even more — it responds to the market trend towards ever larger and heavier workpieces. Load-dependent hydrostatic guiding equips every machine in this range, guaranteeing high rigidity and precision, with individual adjustment of each hydrostatic pocket to limit clearance variation under applied loads, minimal wear on the guiding profiles and excellent shock absorption.
A range of powerful spindles for heavy-duty machining of very large parts
TLDR: Union boring machines feature ISO 50 taper spindles on the standard models, with spindle diameters of up to 160 mm and exceptional power ratings of up to 130 kW for a maximum torque of 17,000 Nm on the heaviest configurations.
Union horizontal boring machines, such as the BFT series, feature ISO 50 taper spindles with spindle diameters typically ranging from 130 to 160 mm, spindle strokes of up to 900 mm and motor power ratings of up to 45 kW, for rotation speeds from a few revolutions per minute up to 1,000 rpm depending on the application. On the largest configurations dedicated to heavy engineering, such as the PR 200/250 series, power on the main spindle can reach 130 kW, for a maximum speed of 2,000 rpm and a maximum torque of 17,000 Nm, ensuring the best fit for machining massive parts in heavy industry.
Union spindles covered (non-exhaustive list)
- Horizontal boring-milling machine spindles, ISO 50 taper, BFT series
- Very high-power spindles (up to 130 kW), PR 200/250 series
- Spindles fitted with load-dependent hydrostatic guiding
- Interchangeable boring heads for large-diameter machining
- Sliding ram spindles for tall moving columns
Interfaces and specifications
The Union spindles we repair mainly come in ISO 50 interface, with spindle diameters ranging from 130 to 160 mm depending on the model, and power ratings of up to 130 kW with a maximum torque of 17,000 Nm on the heaviest configurations.
Our expertise on your Union boring machine spindles
TLDR: Brochexpress works across the entire life cycle of your Union spindles, with the same rigour as for the other brands in our portfolio.
On-site customer service
- Diagnosis and intervention directly on your machine, in the production workshop, to limit downtime linked to dismantling and transporting a large spindle
Full diagnostics
- Inspection of clearances, balancing, bearing condition, sealing and the load-dependent hydrostatic guiding systems, with a detailed technical report
Preventive and corrective maintenance
- A maintenance programme tailored to the extremely heavy machining rates specific to the heavy engineering industry, as well as corrective interventions in the event of a breakdown
Overhaul and refurbishment
- Grinding, bearing replacement, seal refurbishment and rotation testing in the workshop, restoring the manufacturer's original tolerances
Why choose Brochexpress for your Union boring machine spindles
- An independent workshop, with no capital ties to manufacturers, guaranteeing an objective diagnosis
- Expertise in very high-power spindles and hydrostatic guiding systems
- 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 the very high-power spindles of the PR 200/250 series?
Yes, we work on these spindles taking into account their specific requirements in terms of high torque and hydrostatic guiding.
Do you work on the ISO 50 spindles of the BFT series boring-milling machines?
Yes, we diagnose and repair these spindles, whatever the diameter involved (130 to 160 mm).
What is the average lead time for a complete 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 directly on site for very large spindles?
Yes, our team travels to diagnose and, whenever possible, intervene directly on site to avoid the complete removal of bulky, heavy spindles.
Do you offer a preventive maintenance contract for a fleet of Union machines?
Yes, we draw up preventive maintenance programmes tailored to your production rate, particularly relevant for heavy engineering 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 Union range — horizontal boring-milling machine spindles for machining very large workpieces — 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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Union® is a registered trademark. Brochexpress is neither affiliated with, nor a partner of, nor an authorised distributor of the manufacturer Union. 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).