. American engineer and railroad journal . BW- i- I 10. 5. FIG. 6. FINISHING A CONNECTING KOD BRASS ON A VEBTICAX MILLING -MACHINE AT THE CONCORD SHOPS. AMERICAN ENGINEER AND RAILROAD JOERNAL. 229 1 1 11■1 Ilk Hi jy r~ v*>wH FIG. 7—MILLING BACK CYLINDEB HEAD. clamps, reverse them, reclamp them and finish the other sidewith the same tool. The bottom of the recess (Fig. 5) is fin-ished with an inserted tooth cutter in 2 cuts per side, each atthe rate of 14 ins. per minute. The tops of the flanges arefinished in separate cuts at the same rate of feed. Fig. 6illustrates the final operation by w
. American engineer and railroad journal . BW- i- I 10. 5. FIG. 6. FINISHING A CONNECTING KOD BRASS ON A VEBTICAX MILLING -MACHINE AT THE CONCORD SHOPS. AMERICAN ENGINEER AND RAILROAD JOERNAL. 229 1 1 11■1 Ilk Hi jy r~ v*>wH FIG. 7—MILLING BACK CYLINDEB HEAD. clamps, reverse them, reclamp them and finish the other sidewith the same tool. The bottom of the recess (Fig. 5) is fin-ished with an inserted tooth cutter in 2 cuts per side, each atthe rate of 14 ins. per minute. The tops of the flanges arefinished in separate cuts at the same rate of feed. Fig. 6illustrates the final operation by which the side of the box andthe fillet are finished at the same operation by means of around-nosed mill. For this purpose the rotary table is em-ployed, and great accuracy of finish is obtained. Fig. 7 shows a back cylinder head being finished on aBement-Miles vertical milling machine in another shop. Oneof the finished cylinder heads is shown in the work was formerly done on a planer, but because of the. FIG. 8—MILLING SIDE BOD ENDS. lugs to which the guides are bolted it was necessary to planethe piece in two directions. This gave a poor finish, and thetime required was about five hours for the head of a On the vertical milling machine two cutters areused, one for finishing the horizontal surface and the bevelcutter for giving the required angles to the lugs. By thismeans the head for a 25-in. cylinder may be finished in 2%hours, andi with a very much better finish than formerly ob-tained. At the Schenectady works of the American Locomo-tive Company the ends of the side rods are finished on ver-tical milling machines. Fig. 8 shows a Niles-Bement-Pondmachine rounding off the large end of a side rod. This workwas formerly done on slotters at a much greater cost. PERFORMANCE OF MAXLET COMPOUND LOCOMOTIVE. Baltimore & Ohio Railroad. The Mallet articulated duplex compound locomotive, ;o, which is the largest locomotive that has been b
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
