Hydraulic chuck with three jaws clamped on the material (or expands inside the material) giving some workpiece mounting with adjustable clamping force. The adjustability is important because of the nature of the workpiece, cutting or technology. Hydraulic control improves the production process by being able to open and close the jaws from the program (eg. M68 and M69). This gives you the ability to automate processing with automatic barfeeder (eg. long rods).
The principle is quite simple and the most complex element is a hydraulic cylinder with rotary connector. The cylinder is at the end of the spindle shaft on the opposite side of the chuck. Inside the shaft is a drowtube - connecting piston of cylinder with moving parts in the holder, that the cam transfer the force to the chuck jaws.
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