. American engineer and railroad journal . ith a* large number of steps. The adjustable handle rod below the arm starts, stops, en-gages the back gears, and reverses the spindle quickly fortapping, all while the machine is running and without usingthe belt shifter. The brake power of the driving frictiongears on the rear of the arm can be adjusted so that thespindle will slip at a certain strain; for instance, when thetap strikes the bottom of the hole. The feed is positive andcan be varied while the machine is drilling. Figs. 5 and 6 show an interesting motor application madeto a 5-ft. Dreses
. American engineer and railroad journal . ith a* large number of steps. The adjustable handle rod below the arm starts, stops, en-gages the back gears, and reverses the spindle quickly fortapping, all while the machine is running and without usingthe belt shifter. The brake power of the driving frictiongears on the rear of the arm can be adjusted so that thespindle will slip at a certain strain; for instance, when thetap strikes the bottom of the hole. The feed is positive andcan be varied while the machine is drilling. Figs. 5 and 6 show an interesting motor application madeto a 5-ft. Dreses radial drill furnished to the Pittsburgh &Lake Erie Railroad for their McKees Rocks shops. Themotor is a Crocker-Wheeler Company 6% vertical and ismounted as shown in Fig. 6. With the belt drive the shaft P(extended) was driven from the cone pulley shaft by meansof a pair of bevel gears and motion was transmitted to shaftO by means of gears D and C. With the motor drive therawhide pinion A on the armature shaft drives gear B and. FIG. 5.—VERTICAL MOTOR APPLIED TO DRESES RADIAL DRILL. shaft O which in turn transmits motion to the drill C, D and E drive the elevating screw S by means of atumbler gearing arrangement. The motor controller ismounted above the motor and is operated by means of the :;i;i AMERICAN ENGINEER AND RAILROAD JOURNAL. band-wheel on the vertical shaft, which is clearly shown on thehalf tone, and is connected to the controller shaft by a pair ofbevel gears. The half tone (Fig. 7) shows a new drilling device appliedto a radial drill, permitting 60 holes to be drilled at the sametime by operating the usual feed levers. The main casting, orhead, is clamped to the machine sleeve, which is raised andlowered by means of its rack and pinion. The radial spindle runs loose in this head, and, by means ofteeth cut on the spindle next to the sleeve, drives the sixthgear in the first row of 15 spindles, which mesh spindles have 1%-in. ce
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
