. Electric railway journal . h has been followed on the equipment of the New York, Westchester &Boston Railway, is to bore the parts accurately to acertain diameter in relation to the axle, micrometersbeing used in measuring, and then to heat the part andplace it on the axle without pressure. By this methodthere is no abrasion on the finished surfaces of theaxle, wheel or gear due to the process of , as heat is applied to the part when it is removed,very little abrasion occurs due to the process of re-moval. In addition, the parts may be replaced in theiroriginal positions a nu
. Electric railway journal . h has been followed on the equipment of the New York, Westchester &Boston Railway, is to bore the parts accurately to acertain diameter in relation to the axle, micrometersbeing used in measuring, and then to heat the part andplace it on the axle without pressure. By this methodthere is no abrasion on the finished surfaces of theaxle, wheel or gear due to the process of , as heat is applied to the part when it is removed,very little abrasion occurs due to the process of re-moval. In addition, the parts may be replaced in theiroriginal positions a number of times, without loss ofholding power. The axles, at the location of wheel seats, are carefullyfinished and filed as smooth as possible. Wheels andgears as well as tires are bored in. smaller thanthe axle or wheel center per inch of diameter of bore,and then they are heated and slipped into place. Afterthe wheels have been applied and have cooled, they aretested in the wheel press at a pressure of 10 tons per. Heat Method for Installing Wheels on Axles, New York,Westchester & Boston Railway inch diameter of bore. The gears are heated at centerwith a home-made torch using compressed air and citygas but the rims are not allowed to go above 300 , as measured with a thermometer set with thebulb in a special cup which fits between the gear is found that this temperature invariably gives suf-ficient expansion to permit gears to be slipped on with-out any pressure. Wheels are heated with the sametorch until a drop of water at the middle of the spokewill boil freely when dropped onto it. Wheels some-times require a slight pressure in addition to the heat-ing to move them into place, but this is negligible incomparison with those used in ordinary press fits. When wheels or gears are thus shrunk onto the axles,the microscopic points of metal are not smoothed downas they are when a wheel is pushed on cold, and theresult is that these points interlock and make
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