. American engineer and railroad journal . t, however, advocate the useof a constant-speed motor where it can be avoided, preferringa variable-speed motor with a speedrange of about 4 to 1 and operatedby a controller, so as to avoid thenecessity of making the gearchanges. The latter method of driv-ing by variable-speed motors is, ofcourse, proving in practice to be farmore convenient. The engraving on page 245 is anillustration of a variable-speed motordrive applied to a 51-in. boring millbuilt by the Niles Tool Works Com-pany. The motor used in this caseIs a multiple-voltage systemmo
. American engineer and railroad journal . t, however, advocate the useof a constant-speed motor where it can be avoided, preferringa variable-speed motor with a speedrange of about 4 to 1 and operatedby a controller, so as to avoid thenecessity of making the gearchanges. The latter method of driv-ing by variable-speed motors is, ofcourse, proving in practice to be farmore convenient. The engraving on page 245 is anillustration of a variable-speed motordrive applied to a 51-in. boring millbuilt by the Niles Tool Works Com-pany. The motor used in this caseIs a multiple-voltage systemmotor, supplied by the Bullock Elec-tric Manufacturing Company, Cin-cinnati, Ohio, and has a wide speedrange in itself. It is mounted upona separate sub-base bolted to therear of the machines frame, fromwhich position it drives the mainspindle direct through a gear reduc-tion. The speed range available from the motor is doubledby a back-gear at the spindle drive, so that a very largerange of speeds is possible for the drive. The compactness. OEARKD DRIVE UPON A 45-IN. CAR-WHEEL BORING MILL. BEMENT, MILES & CO. VAHIABLE-SPEED MOTOR BY FIELD CONTROL. WESTINGHOUSE ELECTRIC AND MUNUFACTURING COMPANY. and is driven by a variable-speed motor operated uponthe Bullock multiple-voltage system. It drives through a gearreduction and the usual back-gearing direct to the spindle June, 1903. AMERICAN ENGINEER AND RAILROAD JOURNAL. 247 drive, tliiis furnishiiiK a wirtn range of speeds. The controlkl-for operating the motor conveniently located on the ofthe maehine, near the operators feet. • On the opposite page is shown an inleiesting motordrive upon a 54-in. car-wheel boring niill built by WilliamSellers & ®o., Philadelphia, Pa. The motor is a T/^ motor made by the General Electric method of mounting the motor is of especial interest inthis case. It is carried by a bracket built up entirely of anglesand channels, as is clearly shown iij tba
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
