. Railway mechanical engineer . onsteel forging and has some heavy counter-boring cuts, thelimits in the 6-ini and 85 mm. diameter bores being in. The face setting on this piece consists of turning Tool Set Up 9; Finish Reaming 6 In. Diameter ing chucked in the correct position relative to the stops onthe machine. Referring to Fig. 1, the forging is ;t drilled throughwith the inserted bit /. Drills of this type are very econ-omical, especially in drilling long holes, as they have no ten-dency to bind. They consist of a mild steel shank with aninserted high speed steel bit. Wh
. Railway mechanical engineer . onsteel forging and has some heavy counter-boring cuts, thelimits in the 6-ini and 85 mm. diameter bores being in. The face setting on this piece consists of turning Tool Set Up 9; Finish Reaming 6 In. Diameter ing chucked in the correct position relative to the stops onthe machine. Referring to Fig. 1, the forging is ;t drilled throughwith the inserted bit /. Drills of this type are very econ-omical, especially in drilling long holes, as they have no ten-dency to bind. They consist of a mild steel shank with aninserted high speed steel bit. When breakage occurs or the 669 670 RAILWAY MECHANICAL ENGINEER \() M, .W 10 bit is ground away so far as to be of little use, the cost ofreplacement is much less than the cost of a twist drill of thesame diameter. The next operation is counter-boring the85 mm. diameter. This is done with the counter-boringcutter, 2, which is steadied by a roll on the front of the cutter used is double ended and removes an equal amount. !<_ ^^1 ^ Fig. 2—Dotted Lines Indicate First Operations on Clutch Gear of metal on either side, thus tending to steady the cuttingaction of the tool. The next operation 4, consists of counter-boring the , rough turning the lYi, external diameter androugli forming the chamfer. In this operation, the counter-
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
