. American engineer and railroad journal . ents of Machine Tool Operation, with SpecialReference to the Motor Drive. By Charles Day; paper readbefore New York Electrical Society, December, 1902. ThePower Question—Locomotive Repair Shop. By R. W. Stovel;paper read before the Hallway Club of Pittsburg, February,1902. Electric Equipment in Modern Machine Shop Prac-tice. By F. B. Duncan; paper read before the EngineersSociety of Western Pennsylvania, May, 1902. ContinuousCurrent Motor for Machine Tools. By F. O. Blackwell;paper read before the American Institute of Electrical Engi-neers. November.
. American engineer and railroad journal . ents of Machine Tool Operation, with SpecialReference to the Motor Drive. By Charles Day; paper readbefore New York Electrical Society, December, 1902. ThePower Question—Locomotive Repair Shop. By R. W. Stovel;paper read before the Hallway Club of Pittsburg, February,1902. Electric Equipment in Modern Machine Shop Prac-tice. By F. B. Duncan; paper read before the EngineersSociety of Western Pennsylvania, May, 1902. ContinuousCurrent Motor for Machine Tools. By F. O. Blackwell;paper read before the American Institute of Electrical Engi-neers. November. 1902. Upon undertaking the work of drawing up plans for chang-ing the machines to take motors, we found very little infor-mation on file as to the runs of gearing and the spindle speedsof the different machines. The first step, therefore, was toget together this data. At the same time, each machine wasgiven a number for convenience in handling sketches, draw-ings and correspondence. The following shows this data forone of the machines:. DATA FOR LATHE NO. 6. Spindle Speeds. R. P. M. Minimum—Back gear in 6% Maximum—Back gear in 41 Minimum—Single gear 69 Maximum—Single gear 438 31-95 X 24-84 = back gear ratio. The next step was to determine the new range of speedsdesired, and it was decided to base these on a tool steel whichwould take a heavy cut at 50 or 60 ft. per minute. The min-imum speed on a machine cutting various diameters wouldtherefore be for the heaviest cut on the largest diameter, whilethe maximum speed would be for a light cut or for filing onthe smallest diameter of work. In the case of such machinesas shajjers and slotters it was not so much a matter of whatthe tool steel would stand as the speed the machines them-selves would stand, and this was aetermined by running themachines at the maximum speed with the belt and roughlyestimating how much more they would stand. A number ofexperiments were made on the machines by taking large cutsat as high
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