. American engineer and railroad journal . g descriptionof the finishing of a crosshead pin on a Gisholt Big Bore lathe,with a 5-in. spindle bore, is given. The piece of bar stock, A,is held in the three-jawed scroll chuck by hard chuck jaws, B,and also by three chuck blocks, C. The first operation consists in removing the greater part ofthe surplus stock, bringing the pin approximately to size. Thisroughing operation is completed by the cutters shown in the box tool attached to face 2 of the main turret, the cutters E-l,F-i, G-r, H-i, J-i and K-l removing the stock on the surfacesindicated by
. American engineer and railroad journal . g descriptionof the finishing of a crosshead pin on a Gisholt Big Bore lathe,with a 5-in. spindle bore, is given. The piece of bar stock, A,is held in the three-jawed scroll chuck by hard chuck jaws, B,and also by three chuck blocks, C. The first operation consists in removing the greater part ofthe surplus stock, bringing the pin approximately to size. Thisroughing operation is completed by the cutters shown in the box tool attached to face 2 of the main turret, the cutters E-l,F-i, G-r, H-i, J-i and K-l removing the stock on the surfacesindicated by the corresponding letters on the piece itself. Justbefore starting this roughing head the tool post tool, X, is usedfor truing up the end of the bar. The next operation consists in bringing surfaces F and Hto exact size. This is done with cutters F-2 and H-2 in thebox tool on face 6 of the main turret. Cutter K-2 faces the endK of the piece and at the same time gauges the length of thepin : L-2 acts as a back rest for supporting the The box tool on face 4 of the main turret is then swung intoposition and the cutters G-3 and E-3 bring surfaces E and Gto correct size and taper ; the arbor R is arranged as a gaugeto determine the proper location of the tapered surfaces, thusinsuring duplicate work when cullers E-3 and G-3 are onceproperly set: L-3 is a back rest. All surfaces on the pin having been brought to size, the nextoperation consists in cutting the thread, which is done withthe die head on face 3 of the main turret. This completes thepiece; the tool post cutting off tool M supported by post O isthen used for cutting off the finished pin. |, m 1908 AMERICAN ENGINEER \.\l> RAILROAD JOURNAL. 247 3«8 .ii^hhb 1 > Ml 9 If ■^^■uffil j! q SHOWING BORE ruin \T WORK ON CROSSHEAD PIN ON GISHOLT BIG BORE LATHE. After the piece has been cut off the jaws and blocks arc loos-ened and the bar gripper shown oil face I of the mam turretis swung into position. This liar gri
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
