Chuck shown in the picture
Outside diameter: 600 mm, with inside relieving system. Realized for size range from no. 8 to no. 32. The same design applies to greater sizes. Hook has to get a mark allowing centering by lathe tailstock. This device chucks the machining piece through 3 simultaneous operations: radial chucking, stop clamping, position balancing.
Base group houses chucking tools consisting of:
• central point (option for irregular castings);
• pre-loaded spring units for bent supports and sidelong positioning (centering as well, when central point is not supplied);
• base jaws with circular interchangeable heads, case-hardened, tempered and toothed.

Every part of this chucking group is interchangeable and adjustable on positioning.
This clamping system is assembled ahead of machine spindle and equipped with a plate arranged to house balancing masses.
The device is driven by a standard rotary hydraulic cylinder, set at the rear of lathe spindle.
Use of selected high quality steels, case-hardened and tempered. Inside bushings of sliding columns are in GCUSNI2.