Fig. 812.
For work of small diameter for which the plates p would be too large, and therefore in the way, the plate p, [Fig. 811], may be used, being bolted to the follower rest. For work of larger diameter the device shown in [Fig. 812] is sometimes used. It consists of a plate p with a cap c, and bolts for holding the bearings b, b. These bearings are bored slightly larger in diameter than the finished diameter of the work.
The advantage of the use of this device is that bearings of the requisite bore having been selected they may be inserted and adjusted a proper fit to the work before p is fastened to the follower rest, thus avoiding the liability of being either too tight or too loose as may happen when the plates cannot be moved or rotated to test the fit. Another and great advantage is that if after the adjustment of the bearings b, b to the work, the plate p is carefully bolted to the follower rest, the liability of springing the work is eliminated, hence truer work will be produced.
Fig. 813.
A representative of another class of follower rest is shown in [Fig. 813], the hub h is accurately bored to receive collars or rings of various diameters of bore to suit the work. The bore of h may be made to stand axially true with the lathe centres, and thus avoid the trouble of setting, by employing the steady pin s, which, being a close fit in the follower rest and in the lathe carriage will bring the rest to its proper distance from the lathe centres, where it may be secured by the bolt b, which may screw into the metal of the carriage or operate to lift a wedge or guide slip so as to grip the V-slide of the carriage and take up any lost motion between the slide in the rest and that in the lathe carriage.
