Chuck Types
– Self-centering three-jaw chuck with scroll gear
– Universal chuck with three jaws
– Four-jawed chuck for gripping square or octagon material
– Six-jawed chuck for holding thin-walled tubing and plastic materials
– Hybrid self-centering chuck with adjustment screws for improved concentricity
– Two-jaw chuck with soft jaws for conforming to specific workpieces
– Removable jaws for replacement or specialized jaws
– Serrated interface between master jaw and removable jaw to prevent slipping
– Chuck types include collets, SDS chucks, and chucks with indexable positioning and clamping
Chuck Applications
– Used in various industries, including manufacturing, woodworking, metalworking, and construction
– Essential for holding and securing workpieces during machining operations
– Enable precise and accurate positioning of tools and workpieces
– Different chuck types suitable for specific applications and workpiece materials
– Customizable with specialized jaws or fixtures for specific tasks
Chuck Mounting Methods
– Various methods for connecting chucks to spindles or tables of machine tools
– Mounting of drill chucks can involve threaded or tapered arbors
– Removal and insertion may require tools like a vise, hammer, or press
– Large jawed chucks can be mounted using a taper spindle nose with threaded retention
– Backplates with threads or female taper can also be used for mounting
– Mounting of collet chucks can also be done on backplates or dedicated collet-closer setups
Specialty Chuck Types
– Chucks with six or eight jaws available
– Usually self-centering design
– Used for special purposes and provide additional gripping options
– Used in various industries, such as woodworking or metalworking
Chuck Evolution and Performance Evaluation
– Evolution of chucks from pinning, nailing, lashing to modern chucks
– Development of modern chucks like the three-jaw lathe chuck, four-jaw chuck, and scroll chuck
– Arthur Irving Jacobs and the development of the modern drill chuck
– National and international standards for chuck performance evaluation, such as ASME B5.60
– Requirements and methods for specifying and testing chuck performance
– Significance of standards in chuck design Source: https://en.wikipedia.org/wiki/Chuck_(engineering)
A chuck is a specialized type of clamp used to hold an object with radial symmetry, especially a cylinder. In a drill, a mill and a transmission, a chuck holds the rotating tool; in a lathe, it holds the rotating workpiece.
.jpg)
Chucks commonly use jaws to hold the tool or workpiece. The jaws (sometimes called dogs) are typically arranged in a radially symmetrical pattern like the points of a star. Jawed chucks may require a wrench-like device called a chuck key to be tightened or loosened, but other jawed chucks may be tightened or loosened by hand force alone, offering convenience at the expense of gripping force. Chucks on some lathes have jaws that move independently, allowing them to hold irregularly shaped objects. More complex designs might include specially shaped jaws, greater numbers of jaws, or quick-release mechanisms.
Instead of jaws, a chuck may use magnetism, vacuum, or collets, which are flexible collars or sleeves that fit closely around the tool or workpiece and grip it when squeezed.
