. American engineer and railroad journal . re made with previousschedules, there is an apparent decrease in the economy offuel, unless the various points are duly considered, and as ex-plained by the chart. MUTI-SPEED MOTOR. The problem of equipping old machine tools with variablespeed motors, and furnishing such machines as lathes witha sufficiently wide range of speed, has been complicated be-cause of the additional mechanical speed changes required tosupplement the electrical speed variations. The expense andthe amount of work required to do this properly are such that many are discouraged
. American engineer and railroad journal . re made with previousschedules, there is an apparent decrease in the economy offuel, unless the various points are duly considered, and as ex-plained by the chart. MUTI-SPEED MOTOR. The problem of equipping old machine tools with variablespeed motors, and furnishing such machines as lathes witha sufficiently wide range of speed, has been complicated be-cause of the additional mechanical speed changes required tosupplement the electrical speed variations. The expense andthe amount of work required to do this properly are such that many are discouraged from applying motors to belt-driventools, much as they might wish to avail themselves of thebenefits to be derived from such a change. A multi-speedmotor has just been placed on the market by the NorthernElectrical Manufacturing Company, which consists of a vari-able speed field control motor with a mechanical change geardevice attached to and forming part of it, as shown in theillustrations. By this means a speed variation of 4% to 1 can. tl i I!, ii in MOTOR APPLIED TO LATHE.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
