Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . VWYVNT The Dog-Chuck or Jitw-Chuck, shown in Fig. 2611, is provided with dogs or .jaws operating radi-ally and independently in Blots, by means of screws passing through the jaws, which are Becured inthe slots by nuts and washers, as Bhown in Fig. -^\-2. The defect of this class of chuck is that, iffrom wear or other cause the dog fits loosely to the plate, it over when forced to the work. If 3617. the face E of the jaw grips the work, the jaw cants as shown; but if the w
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . VWYVNT The Dog-Chuck or Jitw-Chuck, shown in Fig. 2611, is provided with dogs or .jaws operating radi-ally and independently in Blots, by means of screws passing through the jaws, which are Becured inthe slots by nuts and washers, as Bhown in Fig. -^\-2. The defect of this class of chuck is that, iffrom wear or other cause the dog fits loosely to the plate, it over when forced to the work. If 3617. the face E of the jaw grips the work, the jaw cants as shown; but if the work is gripped at F, thejaw will cant in the opposite direction. A bell-chuck is shown in Fig. 2613, in which the work is gripped in the bore of the chuck by meansof the 8 screws shown. In all these chucks the work has to be set central with the chuck by manipulating the screws indi- LATHE-CHUCKS. 251 vidually. To avoid this difficulty, various constructions have been resorted to. Thus, in Fig. 2614 isshown a spring-cut chuck of wood, which is closed centrally upon cylindrical work by driving thering over the chuck. Another of this class of chucks is that shown in Fig. 2615, which represents a scroll chuck. A, B,C are three pieces which together form the main body of the chuck. Inclosed between A and B isthe ring I), which can revolve independently. In the face of the chuck are three radial grooves, eachof which has two feathers projecting from its sides into the body of the groove. Sliding freely alongthese g
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