CELLS / ROYAL SK40 Spindle Repair

Repairing the KENTURN KC1508H spindle is a key process aimed at restoring its full operational performance. As part of our comprehensive service, we handle disassembly, repair, and reinstallation of the spindle into the customer’s machine. Each stage is carried out in accordance with the highest precision standards, ensuring long-lasting durability and reliable spindle performance.

Neglecting the early signs of spindle wear can lead to very costly consequences. One of our clients experienced this firsthand when they contacted us with a spindle issue in a MAZAK NEXUS 510C-II machining center. If you want to avoid similar problems, read on to see the full spindle repair process and what caused the serious failure.

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.

Two electrospindles from the renowned Italian brand GIORDANO COLOMBO arrived at our service center, equipped with ER32 threads and designed for manual tool change. Both spindles showed similar symptoms – noise during operation, noticeable vibrations, and excessive housing temperature. The nominal speed of these units is 18,000 rpm, and precise operation was essential for the machining processes they supported.

A spindle from the CHIRON FZ 18 W machining center arrived at our service. Two issues were reported: no tool clamping and a worn SK40 taper. This combination typically indicates wear of several components at once: the drawbar mechanism, bearings and the taper itself. We took over the entire process – from removing the spindle from the machine to reinstalling it in line with the CHIRON procedure. Thanks to this the customer has one point of contact, one report and full responsibility on our side.

The electrospindle was collected directly from the customer, located approximately 200 km from our service center. On the same day, we carried out a damage analysis and identified severe damage to the HSK taper gripper arms, as well as significant vibrations and loud operation of the rear bearings.