Jung spindle and motor spindle repair
Brochexpress is an independent workshop specializing in the repair, maintenance and diagnostics of Jung spindles and motor spindles — a German maker of high-precision surface and profile grinders, founded in 1919 and now merged with Blohm as Blohm Jung GmbH, part of the United Grinding group.
Jung, a century of high-precision grinders
TLDR: Jung (founded in 1919 in Berlin by Karl Jung, based in Göppingen since 1948) builds high-precision surface and profile grinders. It merged with Blohm in 2008 within the United Grinding group.
Karl Jung founded his company in Berlin in 1919 to develop high-precision grinding machines. It produced its first hydraulic surface grinders in 1925 and was making high-precision spindles from 1931. After the Berlin plant was destroyed in 1945, the company was rebuilt in 1948 in Göppingen as K. Jung GmbH. It launched the HF 50 series in 1962, then Germany's first CNC surface and profile grinder in 1977 (JF series). Taken over by the Körber Schleifring group in 1998 (renamed United Grinding in 2013), Jung merged with Blohm in 2008 to form Blohm Jung GmbH. The brand claims more than 19,000 machines delivered in over 50 countries.
Grinding spindles at the heart of precision
TLDR: On Jung grinders, the wheel spindle runs at speeds of around 800 to 4,500 rpm depending on the model, with power ratings of around 5 to 10 kW on the examples found.
Jung made the precision spindle one of its strengths as early as the 1930s. The later grinders, from the HF 50 to the JF, JE, J 600 and Vario, equip toolmaking, mould, semiconductor and medical technology workshops. Machine listings give a few reference points: a 2004 J 630-D is listed with a spindle range of 800 to 4,200 rpm, 10 kW at maximum speed (5 kW optional), a 300 mm grinding wheel and a Siemens Sinumerik control. A 1990 JF 415 is listed at 900 to 4,500 rpm with a Heidenhain digital readout. These values vary with model and year; we confirm them on quotation.
On a grinder, a worn Jung spindle shows directly on the part: runout, chatter facets, degraded surface finish. That is why every Jung motor spindle that comes into our workshop goes through a full inspection before any overhaul.
Jung spindles and motor spindles covered (non-exhaustive list)
- Wheel spindles of surface grinders (HF, JF, JE, J 600, Vario series)
- Spindles of profile grinders and grinding centres (JC 500, C 740)
- Spindles of JA, JR and JP CNC grinders
- Spindles of profile dressers (PA series)
- Spindles of older Jung machines, with or without CNC
Interfaces and specifications
Speeds of around 800 to 4,500 rpm and power ratings of 5 to 10 kW found on example machines. 300 mm diameter grinding wheel on a J 630-D. Exact values depend on the model, to be confirmed on quotation.
Our expertise on your Jung spindles and motor spindles
TLDR: Brochexpress covers the full life cycle of your Jung spindles and motor spindles, with the same rigour as for the other brands in our portfolio.
On-site service
- Diagnostics and repair directly on your machine, to limit production downtime
Full diagnostics
- Inspection of play, balancing, bearing condition, sealing and cooling, with a detailed technical report
Preventive and corrective maintenance
- Maintenance programme matched to your production rate, with corrective work in case of failure
Overhaul and refurbishment
- Grinding, bearing replacement, seal refurbishment and run-in test in our workshop, restoring original tolerances
Why choose Brochexpress for your Jung spindles and motor spindles
- An independent workshop, with no capital ties to the manufacturers, ensuring an objective diagnosis
- Experience with precision grinding spindles, where runout shows immediately on the part
- Ability to handle older machines, including those from the 1990s
- Two service locations: Beaurepaire (France) and Lussery-Villars (Switzerland)
- Support from the first intervention through to the return to production
Turnaround and warranty
- On-site service within 48 hours
- 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 Jung grinders?
Yes, we check runout, bearings and balancing of the wheel spindle, then overhaul it.
Do you work on older Jung machines?
Yes, we work on machines whatever their age, including models from the 1990s.
What is the difference between Jung and Blohm?
Jung and Blohm have formed Blohm Jung GmbH since 2008. Jung is best known for precision grinders, Blohm for production grinding. We have a page for each: see our Blohm page.
What is the average turnaround for a complete overhaul?
Allow around 20 working days in our workshop, depending on the condition of the spindle and parts availability (bearings, seals, specific components).
Do you offer a preventive maintenance contract for a fleet of Jung machines?
Yes, we set up preventive maintenance programmes matched to your production rate and the criticality of your machines.
Are you an official Jung partner?
No. Brochexpress is an independent repair and maintenance workshop. We are neither affiliated with, nor a partner of, nor an authorised distributor of Blohm Jung GmbH. Our business covers independent 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).
A reliable partner for your industrial performance
Whether you need emergency on-site service, a complete workshop overhaul or a preventive maintenance programme, Brochexpress puts its expertise at the service of your production. As an independent workshop, we work on your Jung spindles and motor spindles, on surface and profile grinders, recent or older.
Our teams are available from our Beaurepaire (France) and Lussery-Villars (Switzerland) sites for a needs assessment, a diagnosis or a tailored quote.
Request a quoteRelated services
Jung® is a registered trademark of its owner (Blohm Jung GmbH). Brochexpress is neither affiliated with, nor a partner of, nor an authorised distributor of Blohm Jung 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).