. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ndle placed near the base of themachine, and so as to bore horizontally. At one end of thespindle is the drill-head, armed with carbons, and suppliedwith small apertures or outlets for water. At the other endof the spindle is attached a hose for supplying water to thedrill-head. A rapid revolving movement is communicatedto the drill-spindle by the gears shown. The speed and feedmovement may be regulated by the opera
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ndle placed near the base of themachine, and so as to bore horizontally. At one end of thespindle is the drill-head, armed with carbons, and suppliedwith small apertures or outlets for water. At the other endof the spindle is attached a hose for supplying water to thedrill-head. A rapid revolving movement is communicatedto the drill-spindle by the gears shown. The speed and feedmovement may be regulated by the operator with referenceto the hardness or softness, coarseness or fineness, of thematerial to be bored ; and the feed movement may be in-stantly reversed at pleasure. Vhannelimj-machine Bits.—All percussive channelingmachines cariy a gang of cutters bolted together, and inevery case the bits or points are chisel-shaped, some of themhaving straight edses and others diagonal ones. The cuttingtools are in the shape of gangs, instead of being in solid bars, because they are more readilyhandled and transported to the blacksmith shop, and because the breakage of a bit is adjusted 45. Fig. 13.—Diamond gadding machine. 706 QUARRYING MACHINERY. by replacing only one bar in the gang. A 3-(lrill gang is used with the bar channeler, andsometimes with the track channelers in sandstone, or very soft material. The 5-drill gangis used with track channelers. The bits of the gang for channeling differ somewhat accord-ing to the stone. For marble and limestone the points taper sharply, as shown in thefi-nires. In sandstone the points arc more blunt, with heavy edges, so as to prevent wear oigauge. It is also advisable in some kinds of sandstone to curve the cutting edge of the bit-that , to make it convex, and thus prevent wearing of the gauge to a taper and sticking Sticking is a troublesome feature in sandstone quarries, because the bit wears away the•auo-e rapidly The object of the diagona
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
