. Railway mechanical engineer . e bushings, they areturned outside to a press fit in the link supports; the flangesare faced to restore the original dimensions between them;they are hardened and pressed in, and the distance betweenthe inside faces checked. The trunnion bushings are also blanked out on automaticmachines, the outside diameter being ground to a standardsize to fit the bushings for the brackets, after which they Decembfr, 1922 RAILWAY MECHANICAL EXGINEER 711 are carbonized but not hardened. The bore is left smalland the thickness of the flange somewhat oversize to com-pensate for
. Railway mechanical engineer . e bushings, they areturned outside to a press fit in the link supports; the flangesare faced to restore the original dimensions between them;they are hardened and pressed in, and the distance betweenthe inside faces checked. The trunnion bushings are also blanked out on automaticmachines, the outside diameter being ground to a standardsize to fit the bushings for the brackets, after which they Decembfr, 1922 RAILWAY MECHANICAL EXGINEER 711 are carbonized but not hardened. The bore is left smalland the thickness of the flange somewhat oversize to com-pensate for irregularities. The diameter of the trunnion ismeasured with the micrometers and the bushings are boredto make a press fit and the thickness of flanges is madesuitable to restore the standard dimensions and the bushingsare then hardened and pressed in place. This completes the work on the link, except renewing thebushing for the eccentric rod pin. These bushings are madein quantity, bored, case-hardened and internally ground to. g Size of Holes grade sizes to fit standard sizes of pins, the outside diametersbeing left oversize and ground to make a press fit in theholes. In measuring the sizes of these holes, two interesting typesof gages are used. The first type, shown in Fig. 6, consistsof a triangular plate with two accurate straight edges. Along
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
