D. VERTICAL BORING - M A CHI NES.—BrOwn te• Sharpe's Ver tical Chucking - term " chucking-machine" is commonly applied to a turret-lathe in which the revolving head contains a chuck for holding the pieces to he operated npon. It is also, however, sometimes applied to a vertical machine similar to a vertical boring-machine with a chuck rotating in a horizontal plane, and the vertical sliding head carrying a turret for holding a variety of tools. Such a nnichine is the Brown & Sharpe vertical chucking-machine shown in lig. 7. The different tools in the turret-head are easily brought into operation, and, from their perpen dicular position, allow. the chips to fall through the center of the spindle of the revolving table to the floor, and thus avoid danger of trouble from the clogging of reamers, etc. The machine has the capacity to bore a 4-in. hole, and receive a pulley 36 in. in diameter, 141-in. face, with hub 12 in. in length. It makes three cuts, and finishes by reaming without the removal of the tools or work. The revolving table is driven by a five-step cone for a 3-in. belt, and is geared 6 to 1. The steps of the cone are so graded as to make the cutting speed uniform for 5 different diameters of holes. The turret has four holes 11 in, in diameter, and is securely clamped in position. An adjustable dog allows the locking-pin to be withdrawn at any part of its upward motion. The turret-slide has a movement of 21 in., and an auto matic feed which can be easily and quickly changed from the finest to the coarsest required ; it has quick return by hand, and is counter-balanced by a weight inside of column.
Ballard's Boring and Turning S shows a boring and turning mill made by the Bridgeport (Conn.) Machine-Tool Works. It is provided with a turret-head. Its capacity is 38 in. in diameter and 27 in. in height. The table is 361 in. in diameter and has twenty changes of speed. The feed is by belt and has 4 changes. The turret-head is square in form, 10 in. in diameter, with four 24-in. holes. It will unlock automatically at any point, and is re volved by hand. The turret-slide can be set to bore or turn at any angle, and has a movement of 16 in.. with trip at any point. Another form of mill by the same makers has two sliding heads. Its capacity is 37 in. in diameter and 29 in. in height. The table is 364 in. in diameter, and has twenty changes of speed. The feeds are automatic, and range from Ili to of an in. in angular and vertical directions. Each head feeds independent of the other. The heads can be set at any angle, and carry the tool-bars, which have a movement of 18 in, Chord Boriny-Alachine.—Fig. 0 shows a ma chine made by the Niles Tool Works for boring the holes in bridge-chords and 1-beams. The machine is arranged with two independent heads on one bed, adjustable on the bed for varying lengths. The bed may be made of any length
to suit. The two heads are complete in them selves, driven independently, and with all attach ments, feeds, etc., for a complete boring-ma chine. The power is ample for boring four holes, punched 4 to 3 in. diameter, at one time, and the range of speed is such as to adapt the ma chine for drilling down to 14-in. holes. The two columns have both power and hand move ment for adjustment on the bed. The heads have 18 in. reach, boring to the center of 36 in. They will take in under the cutter work 36 in.
high. The spindle has 24 in. traverse. The range of work in length is front 5 to 50 ft. be tween centers. The feeds are by power, and are reversible up or down, and range from to in. for heavy work, and coarser feeds for light work. The bed is formed of wrought-iron 13 in. deep. Two independent carriages for supporting work ou the bed are pro vided.
Fig: 10 shows a horizontal boring-mill built by the E. W. Bliss Co., Brooklyn, N. Y. This machine is especially designed for heavy work, though convenient for general shop use. By its use holes may be bored parallel to each other without resetting the work or traveling same during the process of boring. The table is moved to bring the work in position by a rack and pinion driven by power. The spindle carrying the boring-bar is of steel, in. in diameter, and has a longitudinal feed of :30 in. It is carried by a head with 60 in. vertical adjustment upon a strong upright securely attached to the bed, and the cutter-end of bar is supported through a hush carried by the tail-block upon a similar upright on the left side of the machine. The head and tail blocks are raised and lowered together by means of screws shown, which are driven by power. To compensate for any possible variation in the two vertical adjusting screws, a slight independent adjustment is provided in the tail-block, so as to bring the boring-bar perfectly true with the bed. The driving-cone pulley has four steps, and a heavy back-gear is attached to the spindle. giving eight speeds for the bar. The spindle is fed forward by a rack and pinion having four changes of speed, is driven by a worm-gear, and may be run back quickly by hand. The main spindle is driven directly by a belt from the fit or-shaft, the head may be raised or lowered without changing the length of the belt. The prineipal dimensions of the machine are as follows: Length of table, 7 ft.; width of table, 1 ft.: extreme width in clear between head and tail blocks. 8 ft.: vertical adjust ment of heads, 5 ft.; floor space, 10 X 15 ft.; total height, 9 ft. The weight of the machine is about 20,000 lbs.