FISCHER MFW-1224/42 VC HSK-E40 electrospindle repair on SPEED HAWK 650

Bybmsserwis

Comprehensive repair of FISCHER MFW-1224/42 VC HSK-E40 electrospindle from SPEED HAWK 650

  • Spindle manufacturer: FISCHER

  • Machine: SPEED HAWK 650

  • Taper: HSK-E40

  • Speed: 42,000 rpm

The FISCHER MFW-1224/42 VC HSK-E40 electrospindle operates in very demanding conditions: rotational speed up to 42,000 rpm, HSK-E40 tool interface and a high-precision SPEED HAWK 650 machining center. Under such parameters even minor wear of the bearings, taper or clamping unit quickly leads to reduced surface quality, increased vibration and shorter tool life.

Exactly such an electrospindle arrived at our service – with clear signs of wear, problems with tool clamping and elevated vibration levels. The customer expected not only removal of the failure, but a complete overhaul including removal and reinstallation of the spindle in the machine, so that after service they could rely on stable operation at full speed. We took over the entire process: from on-site diagnostics and removal on the shop floor, through complete electrospindle repair, to installation in the machine, commissioning and cutting tests at the customer’s plant.

For this service we provided a 12-month full service warranty and ongoing technical support.

FISCHER MFW-1224/42 VC HSK-E40 electrospindle overhaul for SPEED HAWK 650 machining center

Electrospindle diagnostics
FISCHER MFW-1224/42 VC HSK-E40

After initial tests on the SPEED HAWK 650 we confirmed typical symptoms of high-speed spindle wear:

  • increased vibration at higher speeds,
  • reduced surface quality after machining,
  • issues with repeatable tool clamping

Service process
for FISCHER MFW-1224/42 VC HSK-E40 electrospindle

1. Electrospindle removal from the machine
We removed the spindle directly on the customer’s shop floor. We secured the SPEED HAWK 650 machining center, disconnected the media and marked all connections so that reinstallation after service would be fast and error-free.
2. Disassembly and diagnostics in the workshop
Once in our workshop we inspected taper runout, bearing condition, clamping unit and sealing system. Based on this we confirmed the need for a complete overhaul – bearings, clamping unit, seals and encoder.
3. Replacement of SKF ceramic bearings and clamping unit
We installed new high-speed SKF ceramic bearings selected for operation at 42,000 rpm and a complete clamping unit. As a result, the spindle returned to stable operation and tool clamping force became repeatable again.
4. HSK-E40 taper grinding and seal replacement
The HSK-E40 taper was precisely ground to restore full contact area and minimise runout. At the same time we replaced around 300 internal seals, responsible for tightness and bearing protection.
5. Encoder replacement
The worn encoder was replaced with a new one. After assembly we checked the signal quality so that the CNC control receives accurate information on spindle speed and position.
6. Assembly, balancing and test-bench runs
The assembled spindle was precisely balanced and tested on our bench. We measured vibration level, temperature and clamping force across the entire speed range, up to 42,000 rpm.
7. Installation in SPEED HAWK 650 and commissioning
Finally we installed the spindle back in the machining center, reconnected all media and performed cutting tests. The customer received a spindle ready for production, plus measurement reports and operating recommendations.
Removal of FISCHER MFW-1224/42 VC HSK-E40 electrospindle from SPEED HAWK 650 machining center Encoder replacement on FISCHER MFW-1224/42 VC HSK-E40 electrospindle during service

Summary of FISCHER electrospindle repair
MFW-1224/42 VC HSK-E40

  • Scope of work: replacement of precision SKF ceramic bearings, new clamping unit, HSK-E40 taper grinding, encoder replacement and complete renewal of approximately 300 internal spindle seals.
  • Repair process: removal of the spindle on the customer’s shop floor → full diagnostics and disassembly in our workshop → component replacement and assembly → balancing and test-bench runs → installation in SPEED HAWK 650 and cutting tests.
  • Benefits for the customer: lower vibration at high speed, stable machining geometry, extended tool life and increased confidence at 42,000 rpm.
  • Reports: the customer received detailed measurement reports for vibration, temperature, clamping force and balancing, along with photo documentation of the key service stages.
  • Effect on the machine: consistent surface quality, no more tool clamping issues, smoother machine operation and reduced bearing load.
  • Safety and warranty: full as-built documentation and a 12-month comprehensive service warranty on the FISCHER MFW-1224/42 VC HSK-E40 electrospindle.
Replacement of bearings in FISCHER MFW-1224/42 VC HSK-E40 electrospindle during service

Frequently asked questions
about FISCHER MFW-1224/42 VC HSK-E40 spindle repair

Typical symptoms include increased vibration at high speeds, deteriorated surface finish, errors during tool changes, unusual noises at start-up and elevated housing temperature. A common sign is also loss of stable tool clamping force.
Even minor pitting or damage on the HSK taper causes tool runout, higher vibration and faster wear of cutting inserts. Precise taper grinding and runout control after repair ensure full contact area and repeatable tool clamping.
Yes, the warranty covers spindle operation across the entire speed range specified by the manufacturer, provided that the machine is maintained according to our recommendations (clean tool taper, proper media quality, regular inspections).
FISCHER MFW-1224/42 VC HSK-E40 electrospindle on BMS service bench Installation of FISCHER MFW-1224/42 VC HSK-E40 electrospindle in SPEED HAWK 650 machining center

Comprehensive electrospindle repair
FISCHER MFW-1224/42 VC HSK-E40

We are so confident in the quality of our work that this long warranty is our standard – BMS Spindle Service is one of the leaders in high-speed FISCHER electrospindle repair as well as many other brands.

HSK-E40 taper grinding of FISCHER MFW-1224/42 VC electrospindle during repair

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