. American engineer and railroad journal . work. The machine is so designed that the spindles, of which therecan be any desired number from four to sixteen (the machineshown has eight), can be set to drill any lay-out desired within itsrange, whether circular, square, rectangular, or in a straight line,or in fact any shape needed. The sectional drawing, through oneof the spindles, together with the general view of the machine,clearly illustrates how the different adjustments of the spindlesare obtained. The whole driving apparatus, connected to themain vertical shaft, is mounted in a steel cas
. American engineer and railroad journal . work. The machine is so designed that the spindles, of which therecan be any desired number from four to sixteen (the machineshown has eight), can be set to drill any lay-out desired within itsrange, whether circular, square, rectangular, or in a straight line,or in fact any shape needed. The sectional drawing, through oneof the spindles, together with the general view of the machine,clearly illustrates how the different adjustments of the spindlesare obtained. The whole driving apparatus, connected to themain vertical shaft, is mounted in a steel casting carried in 413 AAIERICAN ENGINEER AND RAILROAD JOURNAL October, 1911. guides on the column and the feeding mechanism is located atthat point. The weight of the head is counterbalanced by aweight inside the column. Arrangements are made for threedifferent rates of feed for each drill spindle speed. All the gearsthroughout the are of steel or hardened wherenecessary and all bearings are bronzed bushed. The spindles are.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
