. American engineer and railroad journal . ng direct-current motors, the ma-jority being of the variable speed type; fewer examples of theinduction (alternating current) motor are to he found asapplied to machine tool driving, although the induction motoris meeting with marked success for this worli and is fastcoming into favor. The writer is pleased to state that the machine tool buildersare taking an exceptional interest in the subject of motordriving, and are for the most part conducting extensive ex-periments along this line. Important improvements in themethod of mounting the motor, as we
. American engineer and railroad journal . ng direct-current motors, the ma-jority being of the variable speed type; fewer examples of theinduction (alternating current) motor are to he found asapplied to machine tool driving, although the induction motoris meeting with marked success for this worli and is fastcoming into favor. The writer is pleased to state that the machine tool buildersare taking an exceptional interest in the subject of motordriving, and are for the most part conducting extensive ex-periments along this line. Important improvements in themethod of mounting the motor, as well as in the arrangementof the drive, are to be found upon the advocated method ofmotor driving for every machine tool of prominence. Thevariable speed motor is held highly in favor by a great many,but the consensus of opinion seems to be tending toward theuse of two or more runs of gearing in the drive to obtain aportion of the speed changes if a variable speed motor is used,or for all of the variations when using a constant-speed GEARED DBIVE IOU A 24-ISCH LATHE.—AMEUICAN TOOL WORKS CO. DOUBLE COMMUTATOR VARIABLE-SPEED MOTOR M.\DE BY THE COMMERCIAL ELECTRIC COMPANY. The above illustration and drawing represent the inter-esting type of drive recently applied to their lathes by theAmerican Tool Works Company, Cincinnati, 0. The lathehere shown is their standard 24-in. lathe, which is well knownfor its many commendable features. It is driven by a 3 h. p. motor ol the double commutatortype, made by the Commercial Electric Company, Indianapolis,Ind. The motor is mounted on a saddle on the headstock, withcommunication direct to the spindle by a rawhide pinion andintermediate slip gear. The controlling apparatus for start-ing, stopping and reversing is simply and conveniently ar-ranged at the right end of the carriage, in the handle shownwhich operates through a splined controller rod beneath thebed. There are four fundamental speeds obtainable from themotor itself, throug
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
