Facing the necessity of a long and inconsistent spring system inside the shaft of a spindle to accommodate current HSK clamping systems in their spindle solutions made it clear in the first place that a different solution for both high-speed and ultra-precision spindle solutions has to be developed. Therefore self-locking is the key. Back in 2017, and throughout the course of a new spindle development, Levicron had the idea to make the HSK interface self-locking while maintaining the DIN 69893 standard. Instead of two serial systems – the interface plus a spring or locking unit – the self-locking HSK interface leads to only 30% weight and length compared to conventional spring-based systems. The drawbar doesn’t have to rotate with the shaft, and because there is no axial spring load, the ejecting force is reduced by 60% so that no retaining system is necessary to protect the bearings from getting overloaded.
Three months after this idea, our first SLH-x system went into a cycle test with 2 million tool changes. The results were spectacular. On top of a significant improvement of the shaft dynamics, consistency, serviceability, and reliability over the spindle life cycle were improved by a great deal. Ever since, Levicron has not only replaced the HSK clamping units in all of their spindle solutions with HSK clamping but has changed all HSK clamping in their production with their SLH-x.
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