. American engineer and railroad journal . eding mechanism isdriven directly from the main spindle by a chain and sprocketwheels, as is clearly shown in the engraving. Fig. 2. Fig. 3 presents a view of an interesting constant-speed drivefor this type of machinery. This tool is the No. 2 new modelof universal milling machine, built by the Becker-BrainardMilling Machine Co., one of which was thus arranged tor theU. S. Government for use on shipboard. The motor used Is aSturtevant variable-speed motor, and is mounted upon an ex-tension bed-plate, to which the milling machine is bolted. Thedrive i
. American engineer and railroad journal . eding mechanism isdriven directly from the main spindle by a chain and sprocketwheels, as is clearly shown in the engraving. Fig. 2. Fig. 3 presents a view of an interesting constant-speed drivefor this type of machinery. This tool is the No. 2 new modelof universal milling machine, built by the Becker-BrainardMilling Machine Co., one of which was thus arranged tor theU. S. Government for use on shipboard. The motor used Is aSturtevant variable-speed motor, and is mounted upon an ex-tension bed-plate, to which the milling machine is bolted. Thedrive is in this case by belt to a small counter-shaft, which ismounted above the machines column by brackets, as counter-shaft carries a cone pulley to correspond with thespindle cone. Six changes of speed are available from themotor, so that, with the 4 cone changes and the back gear, 48spindle speeds are afforded. This milling machine is the new model with positive geared-feeds, which has only recently been developed by the Becker-. 4. CONSTANT-SJPEED DRI\T2 HENDr-NOBTON UNIVERSAL XllLLlNU . MACHINE wren BOTH CHANGE GEABS AND CONE PULLETSNORTHERN ELECTRIC MOTOR. Brainard Company. The gear combinations in the feed boxpermit of 20 chajiges of feeding speed for each spindle speed,which, by virtue of the easiness of changing, enables this ma-chine to meet every possible demand for universal millingwork. A noticeable feature of this motor application is the arrange-ment of the wiring. The main switch and starting box aresafely mounted upon the rear of the column out of the wayof harm and yet within easy ieach at all times. The wires arecarried down to the motor in an iron pipe conduit for safe-guard—^this is a point too often overlooked. This arrange- 424 AMERICAN ENGINEER AND RAILROAD JOURNAL. ment merits careful eonsideratioii for the many commendablefeatures. The motor drive upon the milling machine illustrated inFig. 4 is probably unrivalled for compactness in the class
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
