BMS Spindle Service

+48 505 909 717
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+48 505 909 717
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+48 505 909 717

Spindle motor
repair

Spindle motor repair – restore full CNC efficiency.
Electrospindles, as integrated motor units, require specialist repair procedures in case of failure. Our service restores full functionality of spindle motors across all types of CNC machines.

We carry out precise spindle motor repairs, including disassembly, diagnostics, rewinding of damaged windings, impregnation, reassembly, and testing of electrical parameters. If needed, we also replace bearings and perform dynamic balancing.

All repairs are performed according to OEM specifications, ensuring long service life, high efficiency, and reliability. We handle electrospindles from all manufacturers – for woodworking, aluminum machining, and precision applications.

Why is
spindle motor repair important

The CNC electrospindle is a critical machine component, responsible for high-speed machining operations. Damage to the motor windings directly affects the performance and reliability of the entire system.

Worn or damaged windings may cause:

  • Loss of spindle power – resulting in reduced machining efficiency.
  • Motor overheating – which can lead to severe damage and insulation failure.
  • Unstable operation – such as irregular speeds and torque control issues.

Professional spindle motor repair restores full functionality, eliminates the risk of downtime, prevents costly failures, and ensures reliable production performance.

CNC electrospindle repair – spindle motor repair

Spindle motor repair
step by step

The spindle motor repair process at BMS Spindle Service includes complete winding diagnostics, core cleaning, rewinding with H-class wires, dynamic balancing, and load testing. We aim to fully restore the original electrical and mechanical parameters, ensuring reliability at high rotational speeds.

1. Diagnostics and electrical testing

We perform insulation resistance tests, winding measurements, vibration analysis, and thermal inspections. These help detect short circuits, open circuits, and other anomalies in the windings or core.

2. Complete motor disassembly

We disassemble the spindle motor into all its parts: rotor, stator, bearings, sensors, and connectors. Each component is checked for mechanical or electrical damage.

3. Core cleaning and inspection

We thoroughly remove dirt, grease, and insulation residues, then perform core loss testing to determine its condition and usability for rewinding.

4. Winding replacement

We wind new coils using H-class enamelled wire, resistant to high temperatures. This ensures durable insulation and optimal electrical performance.

5. Bearing replacement and shaft analysis

We replace worn bearings with high-precision class equivalents and verify shaft alignment to prevent future operational issues.

6. Rotor dynamic balancing

To eliminate vibrations, we dynamically balance the rotor according to ISO 1940 – G 0.4 class. This ensures smooth and quiet operation even at maximum speeds.

7. Final assembly and functional testing

After reassembling the electrospindle, we perform no-load and load tests, as well as temperature and vibration measurements – all to ensure full reliability of the unit.

Spindle motor winding repair Rewinding of electrospindle motors

Common winding failures
and how we fix them

Electrospindle overheating

Worn windings can cause excessive temperature rise during operation.

Solution – New insulation and winding repair eliminate overheating and improve spindle durability.

Loss of power and torque

Damaged windings fail to deliver sufficient energy to the motor.

Solution – Winding replacement and parameter tuning restore optimal performance.

Unstable motor operation, fluctuating RPM

Short circuits in the windings can lead to sudden voltage spikes.

Solution – Spindle rewinding restores smooth and stable rotation.

Frequently
asked questions

Overheating, power loss, unusual motor noise, and unstable RPM.
Yes! The cost of rewinding is significantly lower than purchasing a new unit, and with proper spindle balancing and clamping force calibration, you can achieve performance comparable to a new electrospindle.
The standard lead time is 5 to 10 business days, depending on the model and extent of damage.
Yes! Thanks to winding replacement, impregnation, and load testing, the spindle regains full performance — especially when prior rebuild and assembly were also performed.
Spindle motor rewinding and repair services Electrospindle motor winding repair

Spindle motor repair
by professionals

Damaged windings don’t mean the end of operation – we restore spindle motor performance with guaranteed reliability.

  • Thermal insulation and testing after motor repair

  • Electrical parameters restored to original factory levels

  • 15 years of experience in spindle motor repair

CONTACT

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