The effective size of a lathe, however, may be measured in yet another way, because since the hand rest or slide rest, as the case may be, rests upon the shears or bed, therefore the full diameter of work that the lathe will swing on the face plate cannot be held between the centres on account of the height of the body of the hand rest or slide rest above the shears.
Fig. 481.
[Fig. 481] shows a hand lathe by F. E. Reed, of Worcester, Massachusetts, the mechanism of the head and tail stock being shown by dotted lines. The live spindle is hollow, so that if the work is to be made from a piece of rod and held in any of the forms of chucks to be hereafter described, it may be passed through the spindle, which saves cutting the rod into short lengths. The front bearing of the headstock has two brasses or boxes, a and b, set together by a cap c.
The rear bearing has also a bearing box, the lower half d being threaded to receive an adjustment screw f and check nut g to adjust the end fit of the spindle in its bearings. In place of grooved steps for the belt the cone has flat ones to receive a flat belt.
Fig. 482.
The tail spindle is shown, in [Fig. 482], to be operated by a screw h, having journal bearing at i, and threaded into a nut fast in the tail spindle at j. To hold the tail spindle firmly the end of the tail stock is split, and the hand screw k may be screwed up to close the split and cause the bore at l to clasp the tail spindle at that end.