Fig. 827.
[Fig. 827] shows a two-jawed solid jaw chuck, the bite of the jaws being made hollow, so as not to mark the surface of the work, while they will hold it very firmly.
Fig. 828.
In [Fig. 828] is shown what is termed a box-body two-jawed chuck, which is mainly used by brass turners. The object of this form of body is to permit the flanges, &c., of castings escaping the face of the chuck.
Fig. 829.
[Fig. 829] also represents a two-jawed chuck, the body being cylindrical, and having a V-groove at a to receive the work. The screws c, d may act independently of each other, or a continuous screw may be used, having, as in the figure, a left-hand thread at c, and a right-hand one at d, so that the jaws move simultaneously when the screw is operated. The difference between these two methods being as follows:—