. American engineer and railroad journal . le and affords a very convincing proof of the valueto be derived from the use of this improvement. The actualeconomies that have been effected in many cases from the useof this improvement have been more than sufficient to warrantits application, even upon old drills. The Dreses Machine Tool Company, Cincinnati, Ohio, haverecently perfected a new gear mechanism of this type for useupon the drive of their well known radial drill, which em-bodies a very interesting principle. This we are permitted todescribe in this article, in which is shown a general
. American engineer and railroad journal . le and affords a very convincing proof of the valueto be derived from the use of this improvement. The actualeconomies that have been effected in many cases from the useof this improvement have been more than sufficient to warrantits application, even upon old drills. The Dreses Machine Tool Company, Cincinnati, Ohio, haverecently perfected a new gear mechanism of this type for useupon the drive of their well known radial drill, which em-bodies a very interesting principle. This we are permitted todescribe in this article, in which is shown a general view,Fig 59, of the 60 in. Dreses radial drill thus equipped anddriven by an electric motor, and also details of the main vari-able speed driving mechanism, Fig. 60, and of the change geararrangement upon the arm, Fig. 61, by which additional speedsare made available. It is also to be noted that this companyhas, for some time, been equipping their drills with variable-speed feeding-mechanisms, which operate upon the change-gear PIG. 59.—THE NEW DESIGN OF DBESES RADIAL DRILL, SHOWING AP-PLICATION OF GEARED VARIABLE-SPEED MECHANISMS. The main variable-speed driving mechanism is. as shown inFig. 59, locatedat the rear of the drill column upon an exten-sion of the base, in place of the usual driving cone ordinarily applied, this carries the main driving pulley ofthe tool, but as the tool here shown is equipped for directdriving by an electric motor, the belt driving pulley is replacedby a silent chain sprocket. This variable-speed mechanism isoperated upon a modification of the cone gear and shifting July. 1904. AM KIM CAN BNOINKKIi AM) KA1I-ROAI) JOUENAL. 279 ,,iMion principle) liy which, in this case, seven different speedsare made available; but, as shown in Big. 60, the two cones ofgears do not operate in mesh, and also the arrangement oi tinshifting pinion upon a rocker frame is a decidedly new de-parture, This speed variaior has iwo Bhafta, i and 2, ea
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
