. American engineer and railroad journal . he bed, with twolevers and a steel sliding tumbler, the latter working in con-junction with a cone of eight steel gears. It is frequently necessarj- to cut odd threads, either coarseor fine, and metric pitches, on the same lathe. By means ofthe auxiliary quadrant and the use of special gears, any threador feed can be obtained. Metric pitches are obtained throughthe English lead screw and transposing gears. This feature isof inestimable value, as it provides for all emergencies of thisnature and fits the lathe for a wide range of work, from thefinest t
. American engineer and railroad journal . he bed, with twolevers and a steel sliding tumbler, the latter working in con-junction with a cone of eight steel gears. It is frequently necessarj- to cut odd threads, either coarseor fine, and metric pitches, on the same lathe. By means ofthe auxiliary quadrant and the use of special gears, any threador feed can be obtained. Metric pitches are obtained throughthe English lead screw and transposing gears. This feature isof inestimable value, as it provides for all emergencies of thisnature and fits the lathe for a wide range of work, from thefinest threads to coarse worms. The fundamental speed changes are made through the ma-nipulation of the levers and handwheel on the front of theheadstock. Motor speed can be comparatively high, 1,000 to1,200 , thereby keeping down the size and first cost of themotor. A sensitive but powerful friction clutch is providedon the driving gear for starting, stopping or slightly movingthe gears in the head, to facilitate making speed changes with-. DOUBLE B.\CK GE.\RED HEAD. out shock to the parts or interfering with the motor size of the motor is, of course, dependent upon the natureof the work to be handled. If the lathe must stand up tocontinuous hard work, a large motor must be used, whereas ifit is intended only for a general line of work, one of normalpower will be amply sufficient. The power of the motor shouldbe from 7^ to 15 horsepower. In addition to these special features the manner in whichdetails have been wrought out in the construction of this ma-chine is of exceptional interest. In particular the design of the tailstock merits a careful examination. This is representativeof an extremely massive quadruple clamping stud type, withback bolts running to the top of the barrel for convenience inclamping, and it is further secured against movement by a pawldropped into a rack cast in the center of the bed, which is ex-ceptionally valuable when doing heavy work. This p
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
