Regeneration of the HSD ES 919 electrospindle – full service in 3 days

Bybmsserwis

HSD ES 919 electrospindle service
fast and complete repair at our workshop

The HSD ES 919 electrospindle was delivered to our service center with urgent need for repair due to bearing system failure and damaged sensors. The entire regeneration process, including disassembly and reassembly at the client’s site, took only 3 days. This fast turnaround was possible thanks to a pre-prepared rotating unit – a solution that minimizes machine downtime.

Electrospindle repair
with rotor and sensor replacement

For the repair, we used a pre-balanced rotor – complete, equipped with a new set of top-class ceramic bearings. Using a ready-to-install rotor significantly reduced repair time and allowed for quick installation, minimizing the customer’s production downtime.

The old rotor was not scrapped – it was disassembled and analyzed in our CNC spindle service workshop. After technical inspection, it was marked and secured as a compatible backup for future HSD ES 919 spindle failures. This way, we maintain our own rotation stock of components, offering even faster service response times.

Additionally, due to damage to the sensor ends, we replaced all HSD inductive sensors with factory-new ones to ensure full compatibility with the machine electronics. This guarantees reliable operation of safety and spindle positioning systems.

Electrospindle repair stages
HSD ES 919

1. Disassembly of the electrospindle at the client’s site
performed by our technicians on the same day as the service request. We ensured full protection of the unit and documented its condition before transport.
2. Cleaning and preparation of the spindle
we removed all operational debris, coolant, dust, and residue in our workshop. The housing was cleaned and preserved to make the unit look and function like new.
3. Installation of the new rotor and sensors
precision installation of the pre-assembled rotor, concentricity check, axial play and bearing positioning verification. All inductive sensors were replaced with brand new original components.
4. Balancing the electrospindle
carried out using our 0.4G precision balancer. Final calibration was documented in a full balancing report with dynamic parameters and correction zones.
5. Reinstallation of the spindle in the machine
after final testing, the spindle was installed and started up. We measured clamping force and performed cold and hot tests.

Thanks to these operations, the HSD ES 919 spindle was restored to full working condition and returned to the customer in excellent technical and visual shape.

HSD ES 919 electrospindle service at BMS CNC workshop

Professional balancing of HSD ES 919 electrospindle
key to long life

The balancing of the HSD ES 919 electrospindle was carried out at our facility using a dedicated spindle balancing station. We corrected the rotating mass distribution according to the manufacturer’s specifications.

The installed rotor had already been pre-balanced. The final balancing was carried out after full reassembly. We performed vibration and dynamic force measurements across the entire operating range. A full report was issued and provided to the customer.

Balancing report of HSD ES 919 electrospindle at BMS CNC
Repair of HSD ES 919 electrospindle with new rotor and sensors

Final result
successful HSD ES 919 spindle repair

After the repair and testing were completed, the spindle was reinstalled in the client’s machine tool. The machine started up without any issues, and clamping force measurements, concentricity and operation confirmed top quality of service.

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