. Railway mechanical engineer . e. The shoe or wedge is now placed in a chuck, shown inFig. 8, being held in the correct position for planing bymeans of ^-in. pegs in the chuck body entering the ^ previously drilled. Two of the >8-in. pegs are shownin Fig. 8, the other two being machined on the ends of theholding set screws. The jig and chuck, shown in Figs. 7and 8 respectively, are designed so that when the shoe orwedge is clamped in position the proof center marks are ex-actly in line with tlie top of the chuck. A driving box shoeheld in position ready for planing is shown in Fig
. Railway mechanical engineer . e. The shoe or wedge is now placed in a chuck, shown inFig. 8, being held in the correct position for planing bymeans of ^-in. pegs in the chuck body entering the ^ previously drilled. Two of the >8-in. pegs are shownin Fig. 8, the other two being machined on the ends of theholding set screws. The jig and chuck, shown in Figs. 7and 8 respectively, are designed so that when the shoe orwedge is clamped in position the proof center marks are ex-actly in line with tlie top of the chuck. A driving box shoeheld in position ready for planing is shown in Fig. 9. Theproof circles ^ in. above the top of the chuck. Thegage at A, Fig. 9, is placed on top of the chuck and theplaner tool set to the step called for on the chart, previouslyissued to the planer operator. Thus, if the box is a standardsize, the tool is set to No. 1 step; if it has been planed downand is not a standard size, the tool will be set to the requiredstep. It will be noted that steps on the gage increase by. Fig. 10—Pedestal Jaw Grinder Set Up Ready for Operation 1/16 in. so that if the driving box is planed yg, in. small,the shoe and wedge by this method will each be planed 1/16in. large. The chuck automatically sets up the shoe or wedgeparaUel ready for planing, and the gage determines the toolsettinj without any further measurements. Frame Jaw GrinderIt is necessary to start with frame jaws which are cast steel frames, which are naturally tough and be-come almost case hardened in service, it is practically im-possible to true up a frame jaw by filing. been made to perform this work by machinery and onedevice was designed to machine the jaws by means of aportable milling machine. The two objections to this devicewere its lack of rigidity and the danger of removing too much metal. Obviously the best method would be to use someform of grinding machine which would cut no matter howhard the surface and remove only enough mater
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
