stands were brazing department. almost complete provided and one Upon of these inquiry, in the guide barrel attributed the tto primari ily straightening of elimination was my fast and accurate boring done by the boring machines just described. fhe exterior diameters of all barrels were turned in only cut with carbide tipped tools. The finish after this one was excellent and required only a final grinding operation. machines accomplishing this one cut were large six spindle one cut the 3 2 lathes oe which turned down six barrels at % ‘ + atime. FY‘ *t The * barrels were fed inte a hexagons on the machine by a Pehle ohio. drum in the form of each side of the hexagon were fixtures for six ba re! ide One hexagon was presented to the six bhe tools of the Lathes each of which would make the one necessary cut on one barrel and the diametrically opposite side away from the tools was exposed to the operator for loading and 4 unloading. After. the cuts were index around for a fresh set of finished the six barrels. machine would ~ . The finish grinding operations dually on grinding machine s simila were accomplished to those employed ° indiviat F.N. After both turning and grinding operaticns, the operator cuickly checks exterior diameters of the barrels in a nest of dial gauges set at intervals along the length of a barrel bed gauge, and the concentricity and thickness @ gauge having a metal axis containing spring which is inserted in the barrel, and exterior coordinating with after repeated those points. the reaming This last check was also chockes. the of vparrel walls in actuated points, dial cauces Several ye mpson crush grinding machines were utilized notably to grind the top and curve of the receivers common to the models $70, “VAs, and 760. The machines utilized for th S receiver grinding were provided with automatically tiltinc tables. Several liing of the multispindle machines 870, were 11-48, used, 760 vertical 360° notably to profiling Cincinati mill the interior cuts In one receivers of these, the latch al on both interior :« le 6 receivers were completely an ed in one cycle of the machine. ‘The breechblock grooves 1 6 of these same receivers were also completely milled in 4 ne cycle of one of . these a ~ 2 | # ex 2 af ’ 7 4 “, machi: Lot of br 2 done in * seovery nearly all of it silver brazing. examp ¢ he magazine tube is brazed to the shotgun receivers , &@ metal inse .8 silver brazed ~% bd — > . La oa be . ke . — x :