. American engineer and railroad journal . indlespeeds, ranging from i5 to 360 revolutions per minute, are obtain-able, and when fitted with cone pulleys there are twelve spindle is made of crucible steel, accurately ground, andis fitted with a No. s Morse taper. The feed box is of themakers well-known tumbler gear design, and permits eightchanges of feed, ranging from .007 to .064 in. per revolution ofthe spindle. As the efficiency of a tool of this class depends verylargely upon the convenience of manipulation, special attention tothe location and arrangement of the operating leve
. American engineer and railroad journal . indlespeeds, ranging from i5 to 360 revolutions per minute, are obtain-able, and when fitted with cone pulleys there are twelve spindle is made of crucible steel, accurately ground, andis fitted with a No. s Morse taper. The feed box is of themakers well-known tumbler gear design, and permits eightchanges of feed, ranging from .007 to .064 in. per revolution ofthe spindle. As the efficiency of a tool of this class depends verylargely upon the convenience of manipulation, special attention tothe location and arrangement of the operating levers is feeds are instantly available while the machine is working bymeans of one lever. The quick return has also been redesignedto meet the modern demands of high speed drilling. All journals throughout the machine are large, bronze bushed,and with ample means for oiling. The gears are of steel, of suchpitch and face as to insure long life under heavy working loads,The base is of massive construction and is provided with large T. VERY POWERFUL RADIAL DRILL BUILT BY THE FOSDICK MACHINE TOOL CO. has been designed in 4, 5 and 6 ft. sizes for use of high speedsteels, and which embody every feature to be found on an up-to-date drill. The machine is the standard of the makers, and is ofthe box column type which has proved its superiority in strengthof other designs. It will be noted that the arm is of the massive pipe sectionconstruction, the weight of which is carried on a heavy ballbearing, thus insuring easy rotation in the trunnions. The headis of simple construction, and has a long bearing on the back gears are located in the head, which permits of shortand heavy shafts, very essential for modern high speed furnish three changes of speed, and can be engaged or dis-engaged while the machine is in motion. The reverse functionsare also operated from the front of the head, and are of the well-known toggle joint type, and will transmit the full power p
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
