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Chuck is a mechanical device used to clamp workpieces on machine tools. A machine tool accessory for clamping and positioning workpieces by radial movement of movable jaws uniformly distributed on the chuck body. The chuck is generally composed of three parts: the chuck body, the movable jaw and the jaw driving mechanism. The diameter of the chuck body is 65 mm in small and 1500 mm in large, in which there are through holes to pass through the workpiece or bar; There is a cylindrical or short conical structure at the back, which is directly connected with the spindle end of the machine tool or through a flange. Chuck is usually installed on lathe, cylindrical grinder and internal grinder. It can also be used with various indexing devices for milling and drilling machines.
Classification: from the number of chucks, it can be divided into two jaw chucks, three jaw chucks, four jaw chucks, six jaw chucks and special chucks. From the use of power can be divided into: manual chuck, pneumatic chuck, hydraulic chuck, electric chuck and mechanical chuck. From the structure, it can be divided into: hollow chuck and medium solid chuck.
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