. Railway mechanical engineer . ration, nor much suggestion of the power required to dis-place the metal from the center of the hot billet toward theoutside. So i)owerful arc tlie revolvimi rolls of the piercin<rmachine and so carefully planned is each part of the mas^sive machinery, that the billet is transformed into a tubevnth apparent ease. The newly pierced billet is simply a rather rou^h thick-walled seamless tube. It is raw in appearance and notparticularly true to size and retains the knurl marks of thepiercing rolls on its battered surface. There is positively noweld or seam, howev
. Railway mechanical engineer . ration, nor much suggestion of the power required to dis-place the metal from the center of the hot billet toward theoutside. So i)owerful arc tlie revolvimi rolls of the piercin<rmachine and so carefully planned is each part of the mas^sive machinery, that the billet is transformed into a tubevnth apparent ease. The newly pierced billet is simply a rather rou^h thick-walled seamless tube. It is raw in appearance and notparticularly true to size and retains the knurl marks of thepiercing rolls on its battered surface. There is positively noweld or seam, however, the round bar of steel having been lorm ot rolling machine, of two heavy ofspecial design (Fig. 5), set with askew, which may beadjusted to a thousandth of an inch. As the tubes are fedtlirough these rolls any is removed and thex- are.^iven a smooth, burnished surface, the outside diameter oftlie tube being corrected to some extent. From the reeling machine, the tubes pass to the M/in- or.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
