. American engineer and railroad journal . anism arranged to furnish severaldifferent table speeds, and a geared variable-speed feedingmechanism are features of the boring mills made by the Poole Company, of Wilmington, Del. These machinesare designed for the use of high-speed tool steels, and can bearranged for either a motor or a belt drive. Fig. 62 shows one of their 10-ft. motor-driven boring table rests upon a wide flat annular bearing near its outeredge which is automatically lubricated by rollers located inpockets and held against the bearing by springs. It is drivenb
. American engineer and railroad journal . anism arranged to furnish severaldifferent table speeds, and a geared variable-speed feedingmechanism are features of the boring mills made by the Poole Company, of Wilmington, Del. These machinesare designed for the use of high-speed tool steels, and can bearranged for either a motor or a belt drive. Fig. 62 shows one of their 10-ft. motor-driven boring table rests upon a wide flat annular bearing near its outeredge which is automatically lubricated by rollers located inpockets and held against the bearing by springs. It is drivenby a powerful Hindley worm wheel which is mounted on thespindle between the upper and lower bearing and runs in an 406 AMERICAN ENGINEER AND RAILROAD JOURNAL. oil chamber. Placing the worm wheel on the spindle in thisway enables the operator to elevate the table from its outerbearings and take the thrust on the spindle step bearing with-out destroying the alignment of the worm and 63 shows the arrangement of the worm gearing and. FIQ. 63.—DRIVING MECHANISM.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
