. American engineer . mark (theinside edge of the outer notch when the gage is placed asshown in the illustration) the wheel should be condemned. A chipped flange may occur on the inside or on the throatside as shown in Fig. 6. This is usually caused by trucksbeing loose or the wheels being improperly mounted or theflange striking guard rails or parts of frogs, including cross-ings, that are out of line or to the striking of some foreignobject lodged in tlie throat of a frog. If the chipped placeis on the inside of the flange; that is, away from the gageside, there is no necessity for condemni
. American engineer . mark (theinside edge of the outer notch when the gage is placed asshown in the illustration) the wheel should be condemned. A chipped flange may occur on the inside or on the throatside as shown in Fig. 6. This is usually caused by trucksbeing loose or the wheels being improperly mounted or theflange striking guard rails or parts of frogs, including cross-ings, that are out of line or to the striking of some foreignobject lodged in tlie throat of a frog. If the chipped placeis on the inside of the flange; that is, away from the gageside, there is no necessity for condemning the wheel, but ifit is on the throat side the standard M. C. B. gage should beused and if the chipping is beyond the gage line, the wheelis unsafe for service and should be removed. Misniated wheels, wheels not mounted equidistant from themiddle of the axle, or wheels mounted on trucks that are outof square will have excessive flange wear. A sharp flangewill nut necessarily cause a derailment of itself, but in con-. Fig. 7—Chipped Rir Figs. 8 and 9—A Sharp Flange and the Way It Is Measured with an M. C. B. Gage. is due to several reasons, both in the handling of tlie brakesand in the design of the brake rigging. A slid fiat wheelwill ruin the iron in the wheel at the point of contact and ifthe flat spot is 2i4 in. long in freight service or 2 in. long inpassenger service, or if there is a succession of flat spotsaround the tread the wheel should be removed. .Anotherdefect is that of brake burns. This is caused by overheatingthe tread of the wheel by continued pressure of the brake-shoe against the wheel. An illustration of this defect isshown in Fig. 1. It will be seen that the cracks are at rightangles to the tread of the wdieel which causes it to becomecomby, as shown in Fig. 2. When the wheel has becomedefective from excessive deterioration due to this cause itshould be removed. A seamy tread such as is shown in Fig. 3 may show up afterthe wheel has been in service an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
