3 Jaw Chucks
A chuck is a specialized type of used to hold an object, usually an object with , especially a object. It is most commonly used to hold a rotating tool (such as the in a or a rotating workpiece (such as the or blank in the headstock
Some chucks can also hold irregularly shaped objects (ones that lack
radial symmetry). In some applications, the tool or workpiece being held
by the chuck remains stationary while another tool or workpiece rotates
(for example, a drill bit in the tailstock spindle of a lathe, or a
round workpiece being milled by a
Many chucks have jaws, which are that are arranged in a radially symmetrical pattern (like the points of a ) to hold the tool or workpiece. Often the jaws will be tightened or loosened with the help of a chuck key, which is a-like tool made for the purpose. Many jawed chucks, however, are of the keyless
variety, and their tightening and loosening is by hand force alone.
Keyless designs offer the convenience of quicker and easier chucking and unchucking, but have lower gripping force to hold the tool or workpiece
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