. Railway mechanical engineer . wanted in full stroke, measure the length of the rockerarms and if of unequal length make full scale line drawingof the arms, as at B in the sketch, and lay off ab equal to thelap of the valve plus the lead. Draw the rocker arm in posi-tion bee and measure the distance ed. This is equal to thelinear advance of the eccentric. If the rocker arms are ofequal length, the linear advance of the eccentric is equal tothe lap plus the lead. Scribe line OP on the wheel through the center of the axle tlie as shown at .1, making the angle .v equ:il angle the l
. Railway mechanical engineer . wanted in full stroke, measure the length of the rockerarms and if of unequal length make full scale line drawingof the arms, as at B in the sketch, and lay off ab equal to thelap of the valve plus the lead. Draw the rocker arm in posi-tion bee and measure the distance ed. This is equal to thelinear advance of the eccentric. If the rocker arms are ofequal length, the linear advance of the eccentric is equal tothe lap plus the lead. Scribe line OP on the wheel through the center of the axle tlie as shown at .1, making the angle .v equ:il angle the line RS instead of line OP, and proceed as before. RATTLER FOR FLEXIBLE STAYBOLT GAPS In the drawing is shown a rattler which was designedespecially for cleaning flexible staybolt caps. The drum is16 in. in diameter by 29M in. long, inside, and is madeof ij-in. tank steel. Access to the interior is obtained througha door opening 8 in. wide by 18 in. long. The drum ismounted on brackets of ^/4-m. plate, which in turn rest upon \3. Flexible Staybolt Cap Rattle and the center of the crank pin, as shown at A, and placethe crank pin on the center by leveling line OP with a spiritlevel. Place the eccentric in approximately proper positionrelative to the crank pin and drop lines over the eccentric andaxle, as shown at C. If the rocker arms are indirect and theforward motion eccentric is being set, move the throw of theeccentric toward the crank pin until one-half the differencebetween mn is equal to ed. Mark the eccentric in this posi-tion and kev to the axle. a table 31 in. high, built up of angle sections and plates. \No. 2-R Little Giant drill motor is used to drive the motor is supported by its handle, which rests in suitablebrackets provided at one end of the table. The connectionbetween the motor and the drum shaft is made by means ofa square socket which slips over the square end of the shaftand is made with a standard tang to fit the drill socket. Thebearings for the d
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
