. Electric railway journal . Jvurnal CHICAGO ELEVATED—GAP GAGE FOR SHORT VALVE STEM ; APPLICATION OF WHEEL-DEFECT GAGE shaft are compared by chalk-marking the shaft. Apinion may not be thrust against the collar at theback end of the shaft fit, since this introducesunusual stresses and may cause loosening. After a pinion has been fitted to the shaft, it isheated in boiling water for twenty minutes. Aftertreatment by the boiling process, it is placed upon theshaft and tapped lightly into place, and the nut is ap-plied to keep it from backing off. After the nut is inplace the pinion is again tapp
. Electric railway journal . Jvurnal CHICAGO ELEVATED—GAP GAGE FOR SHORT VALVE STEM ; APPLICATION OF WHEEL-DEFECT GAGE shaft are compared by chalk-marking the shaft. Apinion may not be thrust against the collar at theback end of the shaft fit, since this introducesunusual stresses and may cause loosening. After a pinion has been fitted to the shaft, it isheated in boiling water for twenty minutes. Aftertreatment by the boiling process, it is placed upon theshaft and tapped lightly into place, and the nut is ap-plied to keep it from backing off. After the nut is inplace the pinion is again tapped with a sledge hammer,and any movement is followed up with the nut. Thepinion is not forced into place by hard blows as thisintroduces internal stresses when the metal cools, great-ly decreasing its ability to resist service shocks. Water-Cooled Mandrel Babbitting Molds The water-cooled babbitting molds used in this com-panys shops have greatly increased the output. A setof these is shown in an accompanying CHICAGO ELEVATED—AXLE-TESTING SET A strap-iron collar with two setscrews is fitted toeach mandrel and serves to fasten the bearing shells inposition while the babbitt is being poured. After thebabbitt has been poured cold water is allowed to cir-culate through the mandrel to chill and harden the bear-ing surface. An excellent bearing surface is obtainedwithout the blisters often produced by heated greatest advantage of the use of this method lies inthe increased output, for, as compared with the use ofa mandrel not water-cooled, the water-cooled mandrelhas made it possible to increase the output of bearingseight to twelve times. Motor Testing All motors are thoroughly tested after they have beencompletely assembled on the shop floor before being re-turned to service. This test, which is made primarilyto determine the condition of the bearings, lasts foran hour, the motor being operated at the maximumspeed attained in service. Inaccuracies in
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
