SUNMIL milling machine spindle repair

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.

Below we present photos taken during the loading of spindles at our facility. This is where the safe transport of CNC electrospindles to and from customers across Poland and Europe begins. Each spindle is secured according to the highest standards, ensuring complete safety on its way to repair.

After receiving the spindle, we began disassembly and cleaning of all components. Each part was cleaned in ultrasonic and mechanical baths, which allowed us to carry out precise geometric measurements and damage diagnostics.

The spindle in the HAAS VM-2 operates at high speeds and loads, where every micron matters for surface quality, tool life and process stability. In this job the goal was a full HAAS spindle repair with restoration of the SK40 taper geometry and achieving the lowest possible runout at an L-300 test length. After completion we confirmed runout below 2 µm on the test bar and 1–2 µm directly on the taper—values typical of a premium, like-new spindle.

The complete overhaul of the KESSLER spindle in our workshop restored factory precision and process stability to the DMG CMX 1100 V. We delivered a comprehensive service scope including bearing replacement, SK40 taper restoration, installation of a brand-new OEM drawbar assembly, sensor calibration, and replacement of all seals. Additionally, we supported the customer during self-installation of the spindle and helped eliminate the root cause of the previous coolant ingress. The service is covered by a 12-month warranty.

Two EMAG electrospindles were delivered to our service center. Despite differences in size — one weighed 2 tons, the other 1.8 tons — both required the same high level of technological expertise.