Turret-head machines have not heretofore been constructed for work of this length. nor for doing work so long in proportion to its diameter as can be done on this machine.
Long work of small diameter is finished by means of the tool shown in Figs. 17 and 18, the former being a front view and the latter a rear view of the tool. winch is called the "turner." The tool is adjustable by screws, and can be moved to or from the work by a cam, which is moved by a small lever, so that the tool may be run into the work for necking, or. in the case of long and slender work, the tool is opened, run up close to the chuck, where the work is held securely, and the tool run in to the required depth. It is then fed backward toward the end of the work, the usual back-rest following behind the tool, and bearing on that portion of the work that has been trued. In this way much of such work is finished at a single emit from the rough, though where it is necessary another cut eau be run over it in the other direction, the rest in this case, ns iu the other, following the tool. The ent-off slide, a separate view of which is shown mut Fig. 29, is bolted to the top of the turret, as shown by the rear view of the machine, and is so arranged that the turret can be run up miller the (Amuck. and the ent-olf used without interfering with any of the other tools. Provision is made fur using three tools in the slide, and as they have the longitudinal motion due to the move ment of the turret, and eau be fed into the work by H. ipvvr and small pinion. the three tools can be n-ed for different purposes. such as neck ing in, Hitting oaf, or turning if desired. The tom-le Myr for hollow mills, taps, dies, 'vein eN, etc.. is shown by Fig. 21. it is attached to the turret in the same way as the other touts. The chuck used nn the spindle is shown by the group of emits (Pig. 211), which represent it in various and in detail. It can be (lamed and closed without stopping tilts ma chine by the movement of the lever designated " roller-feed and chnek-lever" in the outline view (Fig. 15), this lever, by suitable connections, being made to slide the collar on the outside of the chuck which opens and closes the collet in the manner indicated in Fig. 23.
The same lever is connected to the automatic feeding device (Fig. 22). There are two rollers that bear on the stock, one at each side. These, while a cut is being taken, serve to steady the work and hold it central in the spindle. When the lever is moved to open the chuck, and its motion is then continued in the same direction, it moves a plunger which en gages with one of the V-grooves on the spiral ring-gear (Fig. 22), preventing it from turning.
The spindle of the machine, continuing to turn, carries the spiral pinion with the two worms, worm-wheels, and feed-rolls with it, and by this motion about the spiral ring-gear they are made to rotate on theft own axes, and the stock is thus fed forward through the chuck to the stop, and held there,until the chuck is again closed.
The principal dimensions of the machine are: Working length, 24 in.; hole through spindle, 2k in. ; diameter of turret, 16 in.; swing over bed, 16 in.; width of belt used, 3+ in.; length of bed, 6 ft. S in.; weight, 2,600 lbs.
Terre/-Lathe with Roller-Feed and Automatic Chuck.—Fig. 23 shows the revolving roller feed and automatic chuck, built by the Jones & Lamson Co. for their turret-lathe and screw maphines. Fig. 24 shows the turret-lathe with the feed and cheek applied. The operation is as follows: The lever near the head is pulled forward; this opens the chuck, at the same time starting the roller or wire feed, and the stock is rapidly fed np to the stop-gauge; when the lever is thrown back the roller-feed stops, and at the same time the chuck closeS firmly upon the stock, and the next operation is ready to be performed. This is done with two strokes of the lever, without the operator leaving his post and without stopping or reversing his machine. (See also SCREW-MACH1NES.) Twrrel Chocking-Lathe.—Fig. 25 shows a 36-in. turret chucking-lathe made by the Lodge & Davis 3Ittehine Tool Co.. of Cincinnati. This lathe swings 36 in., is back-geared, with power feed, and has an 8-1 t. bed. The cone-pulley has four changes for 3+-in. belt ; largest speed is 14 in. in diameter. The spindle is of steal, with 1i-in. hole through its length. and runs in bear ings of ; the front bearing is 3 in. in diameter, 5+ in. in length. The turret is 12 in. in diameter, revolves automatically, and has 6 holes bored 1+ in. in diameter. The turret-slide is operated by a pilot-wheel, and is provided with adjustable automatic stop to the power-feed, and will bore holes up to 13 in. in length without resetting. The turret-slide is actuated on the shears by rack and pinion.
The feed is thrown in and out on the front side of the turret. A friction counter-shaft with re verse motion is provided, in order that taps and dies may be used.