. Factory and industrial management . iredhole while held in the hands of a workman. This little tool, weigh-ing 18 pounds, with 80pounds of air pressurewill drill a j-^g inch holethrough cast iron oneinch thick in one min-ute. It is especiallyuseful for centering andcounter-sinking lathe work, drilling holes for tap bolts and screws, orgrinding-in valves. The reamer (Fig. 23) has revolutionized the methods of reaming the rivet-holes and the tapping andinsertion of stay-bolts in the use of heavy lathes,planers, or other large shop toolsmuch annoyance and loss of timeresults from the
. Factory and industrial management . iredhole while held in the hands of a workman. This little tool, weigh-ing 18 pounds, with 80pounds of air pressurewill drill a j-^g inch holethrough cast iron oneinch thick in one min-ute. It is especiallyuseful for centering andcounter-sinking lathe work, drilling holes for tap bolts and screws, orgrinding-in valves. The reamer (Fig. 23) has revolutionized the methods of reaming the rivet-holes and the tapping andinsertion of stay-bolts in the use of heavy lathes,planers, or other large shop toolsmuch annoyance and loss of timeresults from the difficulty experi-enced in shifting belts. A com-pressed-air belt-shifter designed bysome ingenious mechanic madethis trouble a thing of the machine shops now use com-pressed air for so many importantoperations that a stoppage or break-down of the air machinery is a verymuch more serious matter than ifthe shop engine were to be sud-FiG. 22. AIR-DRIVEN BREAST-DRILL, dcnly placed kois du combiit. In FIG. 21. RIVET 672 THE USE OE COMPRESSED AIR.
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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectengineering
