M ETAL Universal Radial 1 represents a versal radial drill built by the Niles Tool Works, I,t,iiton, Ohio. A heavy. rotating column. mounted upon a long supporting sleeve, which is secured to the base-plate. carries a radial arm, which can be clamped in miy position. The machine is driven from an overhead coun ter-shaft operated by bevel-gearing. and by a central spur-gear seen at the top of the column. This also communicates motion through tumbler-gearing to the screw, which is operated to raise and lower the arm by power. Motion is communicated to the drill-spindle from the cone, which is strongly back-geared by means of spur-gears, a splined shaft, and bevel-gear ing. The arm is in form similar to a hox-girder, and is ill one piece. The drill-head is se eurely gihbe.d upon Ow aria, and is adjustable to any position thereon. It is also adjustable to any angular position upon its saddle.
Sensitive 2 represents a sensitive drill manufactured by W. & .1. Barnes. Roekfurd, 111. Ry the friction-disk., shown in the, cid, the speed of the drill-spindle can be inereased or diminished, or the motion reversed, without slopping the machine or shifting bells. The food-lever is provided with it sensitive adjustment, which makes it possible to use the smallest drills. The platen can be moved on the column, :Ind clamped at any desired height.
Multiple Traverse 11171111hle, shown in Fig. it, is built by the Niles Tool Works, and is similar in design to the usual pattern of multiple drill, except that it is vided with n table arranged to slide upon the bed. Machines of this class are especially de sirable when it is required to drill a number of holes in heavy pieces clamped together. such as vault-doors, etc. In work of this kind the separate pieces can be fastened together upon the table and any desired part brought under the drills. The spindles have 12-in. travel, and each has in dependent power-feed with three changes. They are also arranged for hand-feed, and each is counterweighted and has quick return. The machine is capable of drilling three lfin. holes or two 2-in, holes at the same time through steel plate.
for 4 shows a used to overcome the friction of the collar of the spindle of a drill press. It consists of two collars, one having a flange fitting into a rabbet turned on the corner of the other, to prevent dirt from get ting in from the out side. both the collars be ing provided with ahalf round groove turned on their face, in the balls revolve. The col lars. as well as the bulls, are made of fine steel. (Sec also BEAnms.
BA Leeds' Horizontal and Radial Drill.—This machine (Fig. 5) is designed to work on or from a drill-press, and is driven direct from the drill-press spindle. It is a substitute for the hand-ratchet, autl is useful in drilling the ends and diagonal parts of frames ; it can also be unmated on the work and driven by a sliding-shaft and universal joints. Drilling in all directions can be done, with the two taper-shanks and the horizontal and vertical movements, by loosening the nuts shown.
hover consumed in study of the power required to drive an ordinary drill press has been made by Prof. Lester P. Breckenridge, M. E., of Lehigh University. Indicator cards were taken from an apparatus, as shown in Fig. 6. consisting of a cylinder of east-iron, with thinv at the base, and bored out to receive a plunger. The area of this cylinder was 10 sq. in. Near the bottom of the plunger three grooves in. deep were cut, and about in. apart, in order to prevent leakage of oil, which was placed in the cylinder below the plunger-. Communication with oil was then made to a steam-irange on one side and an indicator on the other, as shown. The details taken are shown in the subjoined table, by means of which an accurate calculation may be made at any time as to capacity and time required to do a given piece of work with a given speed of drill: Drilling-Mach i ne for Boiler Slayboles. —Fig. 7 represents a drilling-machine built by Thomas Shanks & Co., Johnstone, Scotland, for drilling and tapping the holes for screwed stays in ladler shells and backs. There are t wo drills carried by separate standards, each having a traverse of 2(1 ft. The vertical range is 10 ft. The spindle may be set at an angle of 2.1 . The bed is 4 ft. ti in. wide. In the driving headstock are four speol-cones and two ',archaises of gearing for light or heavy interchangeable by levers. The stand ard is moved by a grooved driving-shaft with fast and louse pulleys. and the reversing motion is by bevel-gear and clutches worked by hand. The vertical driving-shaft has strong bevel gear and clutches to stand the tear and wear of reversing, and connects by the driving-gear to is spindle :3/1 in. in diameter. Two bevel-wheels—one line and the other coarse piteri—are keyed on the revolving tube carrying the spindle. Quirk is obtained through direct gear and slow motion by spur-wheel and pinion. The thrill-carriage is balanced and its level is alterable at will. There is a second standard in the machine. with a horizontal shaft in the bed parallel to the other. Revolving cradles are placed in front of the machine, and these are not only for dittereat diameters and lengths of boilers, but also in such at manner as to support a boiler with either its back or- its side toward the thrills, as may be required. When used for the latter purpose, the cradles can be revolved by power, so as to bring at new part of the shell within range of the machine. (See _Engineering, OeI. 24, 1890.) Portable Mack ine.—Fifr. S represents a portable hydraulic drilling machine designed by M. Berrien- Fontaine, of Toulon, France, and used in the Toulon dock yard. Such machines acre capable of drilling in their place, and after erection, nearly all the holes re quired for rivets, bolts, etc.. in all kinds of iron or steel structures— such as ships, bridges. girders, and boilers—wherever 'hydraulic press ure is available for working them.