Hor-i-zon′--tal lathe.
A vertical turning and boring machine. The one illustrated is set up in the Boston Navy-Yard, and is, perhaps, the largest in use, being of such a size that a monitor turret can be turned in it entire. The work-table, instead of traveling in slides, is circular, and revolves like a face-plate on a vertical axis. The tools are held in heads on a cross-slide, which is fitted to two uprights resting on checkpieces bolted to the main casting or foundationpiece. On the under side of the revolving table is a bevelgear driven by a pinion, which may be backed out of gear by means of a hand-wheel on a thread on the horizontal shaft. The hub of this pinion, being slightly larger in diameter than the pinion itself, is used as a journal, by means of which the pinion is caused to revolve with great steadiness, and when out of gear the pinion is within the pillow-block. This is required when a quick motion is given to the table by means of a pair of miter-gears, one of which is attached to the lower end of the table-bearing. One of the heads on the cross-slide is fitted for drilling, the spindle being 4 1/3 inches diameter, with a travel of 18 inches, independent of the cross-slide. This drill-spindle is driven by means of miter-gears and shafting from a cone placed on the top of the upper cross-brace. The revolving table is driven by means of a 6-inch belt running on a 5-speeded cone, the smallest pulley of which is 17 inches diameter, the largest 34 inches, strongly back-geared in such manner as to allow 20 different speeds. The conical bearing of the revolving table is lined with Babbitt metal. By placing the uprights with cross-slide near the revolving table, the drill may be placed at any point within the surface of a diameter of 12 feet; while in the same position the other head may be used for the purpose of boring, facing, or turning anything of the same size. By moving back the uprights near the ends of the cheek-pieces the machine is capable of boring, facing, or turning anything up to 24 feet diameter. The main casting, in which the table revolves, is 10 feet 4 inches square by 24 inches deep, except at the center, where a projection receives the lower end of the bearing; at this point it is 9 1/2 inches deeper. This casting weighs 26,000 pounds; weight of circular table, 13,000; weight of the cheek-pieces on which the uprights move, 14,000 pounds each. These pieces are 21 feet long, 24 inches high, 3 inches wide; the cross-slide 15 feet long, 33 inches high, deepest part of arched back 22 inches. This is cast hollow. The two uprights are connected at their upper ends by means of a cross-brace 11 feet 4 inches long by 36 inches deep. The tool-holder slide weighs 1,000 pounds, and is fitted with rack and pinion for quick movements, and screw for self-feed. The cross-slide is raised or lowered by means of screws and wormwheel driven by power. The uprights, with the [1121] cross-slide, may also be moved to and fro on the check-pieces by means of power applied to screws working in nuts at their lower ends. |
| Horizontal lathe. |
