OKUMA M560 Electrospindle Repair – Complete Overhaul Process

Bybmsserwis

A machining center OKUMA Genos M560 arrived at our service with spindle wear symptoms: increasing noise at high speeds, noticeable vibrations, and occasional alarms during tool changes. Our goal was to restore stable operation, repeatability, and full speed parameters. Below we present the course of the OKUMA M560 electrospindle regeneration as a completed case study.

Spindle specification:

  • Manufacturer: OKUMA

  • Machine model: OKUMA Genos M560

  • Tool taper: SK40

  • Max speed: 15 000 rpm

OKUMA M560 electrospindle repair

Cause of the problem
noise, vibrations

We began by safely removing the spindle from the machine and performing an initial diagnosis. We measured runout on a test holder, checked operating temperatures and seal condition. We recorded baseline data for comparison with post-service results. The assessment confirmed bearing wear, marks on the SK40 taper, and reduced clamping force.

Complete overhaul of the OKUMA M560 electrospindle Full service of the OKUMA M560 electrospindle

Scope of work performed
during the OKUMA M560 electrospindle refurbishment

We carried out the process comprehensively, in line with our service standard:

1. Cleaning and drawbar system service
We cleaned the housing and all components from coolant deposits and old grease. We disassembled the tool clamping mechanism, assessed the Belleville springs, guides, and sliding elements, replaced worn parts, restored smooth operation, and prepared the system for clamping-force calibration.
2. Precision bearing replacement
A key stage was replacing the bearings. We installed new precision bearings of specialist manufacture made of high-temperature steel, selected for operation at 15 000 rpm. We set the correct preload and ensured assembly cleanliness in controlled conditions to minimize any contamination risk that could shorten bearing life.
3. SK40 taper refurbishment
Next, we refurbished the SK40 taper. We removed scratches and restored the geometry of the tool seat. After machining, we verified runout—values obtained allowed for stable holder seating and reliable dimensional repeatability. This step directly improved surface finish quality.
4. Rotor balancing and clamping calibration
After assembly, we balanced the rotating group to a high accuracy class, reducing vibration sources throughout the speed range. We calibrated the tool clamping force to SK40 requirements, eliminating previous alarms during tool changes.
5. Final tests and service report
Finally, we conducted full performance tests. We recorded the vibration spectrum, noise level, warm-up test, and load trials. We verified spindle behavior in several scenarios—from low to maximum speeds with different ramp times. The results were compared with the initial diagnosis and documented in a service protocol. Thanks to this, the OKUMA M560 electrospindle service was confirmed with hard data, not just the feeling that “it works better”.
OKUMA M560 electrospindle runout measurement Runout measurement on test bar – OKUMA M560

Precision
of the highest class

The effect after installation in the machine was clear. The spindle ran quieter and smoother, temperature stabilized faster, and vibrations dropped to a level that did not affect surface quality or tool life. Tool change issues disappeared and no unplanned alarms occurred. Operators reported improved roughness and dimensional repeatability on parts produced on the OKUMA Genos M560.

After completion, we provided operating recommendations. The customer performed a short spindle run-in—gradually increasing speed while monitoring temperature—and implemented a simple inspection schedule. We recommended regular cleaning of SK40 holders and periodic clamping-force checks to keep the effect of the OKUMA M560 electrospindle repair as long as possible.

Why it’s worth performing
OKUMA M560 electrospindle refurbishment

  • Lower cost compared to a new unit
  • Fast turnaround and parts availability
  • Guaranteed precision and operational safety
  • Balancing, clamping calibration, and a final report
OKUMA M560 electrospindle refurbishment OKUMA M560 electrospindle service

Trust our experience
choose CNC spindle specialists

In summary: we performed a complete OKUMA M560 electrospindle refurbishment—from disassembly, cleaning, bearing replacement, and taper restoration to clamping calibration, balancing, and final tests. This OKUMA M560 electrospindle service restored machine stability and production repeatability and peace of mind.

After completion, the OKUMA M560 electrospindle was packed and secured for shipment in a special transport crate, with documentation and test report attached.

If you notice similar symptoms (noise, vibrations, heating, ATC alarms), this path is the fastest way to safely return to parameters.

Preparing the OKUMA M560 electrospindle for transport

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