Ringspann's HDDS Provides Alternative to Hydraulic Mandrels

The HDDS by Ringspann is an inner clamping system that can serve as a mechanical alternative to hydraulic expanding clamping mandrels. According to the company, the system provides a true running accuracy of less than or equal to 5 micrometers and is suited for workpieces with bores of tolerances ranging to class IT10. 

Unlike hydraulic expanding clamping mandrels, the HDDS’s mechanical expanding sleeve mandrel eliminates the risk of leaks and increases process safety in series production. The only source of wear in the system is its clamping discs. When users need to replace the discs, they can do it themselves without removing the mandrel from the spindle. 

Some versions of the HDDS can clamp bores from diameters of 23 mm. The system also works on applications that have bores with inner geometries that are interrupted by grooves. In addition, its mechanics perform a pull-back action, pressing the workpiece against a backstop and aligning it, making it suitable for workpieces with short clamping lengths.