. Railway mechanical engineer . le isused on that system, the over-balance in any wheel beinglimited to an amount which, when multiplied by timesthe radius in feet of the center of gravity of the counter-balance, will not exceed 75 per cent of the static wheel following method is used in correcting counterbalances:To ascertain the weight in the driving wheels which is un-balanced by the weight of attached parts, take two horses ofconvenient size and on these place two rails weighing notless than 72 lb. per yd. The upper surfaces of these shouldbe made perfectly smooth and covered
. Railway mechanical engineer . le isused on that system, the over-balance in any wheel beinglimited to an amount which, when multiplied by timesthe radius in feet of the center of gravity of the counter-balance, will not exceed 75 per cent of the static wheel following method is used in correcting counterbalances:To ascertain the weight in the driving wheels which is un-balanced by the weight of attached parts, take two horses ofconvenient size and on these place two rails weighing notless than 72 lb. per yd. The upper surfaces of these shouldbe made perfectly smooth and covered with a thin lubricantPlace the mounted wheels so that the journals will rest onthe rails, which must be parallel and perfectly level bothlongitudinally and transversely. Draw one line across theface of one of the wheels, through the centers of the axle andcrank pin and another line through the center of the axleat right angles to the first one. The second line indicatesthe position of the pin and counterbalance on the opposite. Method of Weighing Counterbalances on the Southern Pacific wheel. On a line midway between these two, viz., 45 each, clamp a 10-ft. wooden straight-edge. Measureoff from the center of the wheel on the straight-edge a dis-tance of 60 in. and, with the straight-edge level, place avertical support at this point with its lower end resting on aplatform scale. This will weigh both counterbalances at thesame time. Ascertain the weight of the vertical support andthe end of the straight-edge resting on the scale, the otherend being supported at a distance of 60 in. from the scaleor at the center of the axle. Subtracting this weight fromthe former weight, the remainder will be the weight of bothcounterbalances corrected for a distance of 60 in. from thecenter. To find the effective counterbalance for one wheelat crank pin distance, multiply this remainder by the lengthof the lever—that is, 60 in., and by (secant 45 deg.)and divide by twice the c
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
