. The railroad and engineering journal . machine as far as two settings or adjustments of the machine are requiredfor all four sides of the steam-chest seat, because, when thegroove is finished on the outer side of the valve-face, all thatis required is to loosen the top nuts on the studs supportingand passing through the arms, lift up the machine and replaceit facing the boiler, when, having been secured, work can beresumed. The same applies to the other sides, the forwardand back ends ; after it is set for one and the cut finished, themachine is turned about and replaced on the
. The railroad and engineering journal . machine as far as two settings or adjustments of the machine are requiredfor all four sides of the steam-chest seat, because, when thegroove is finished on the outer side of the valve-face, all thatis required is to loosen the top nuts on the studs supportingand passing through the arms, lift up the machine and replaceit facing the boiler, when, having been secured, work can beresumed. The same applies to the other sides, the forwardand back ends ; after it is set for one and the cut finished, themachine is turned about and replaced on the same studs. But one size of the machine is built, as provision for verylarge steam-chest seats is made by supplying extension feetor plates fitted with a T-slof -nd hole for the ordinarv slud. stock ; this allows a great adjustment, taking in the shortest aswell as the longest crank-pins. The center containing thespindle fits exactly into the original center of the pin, holdingthe outer end true. It is fastened by the four-jawed scroU-. CllESr SEAT MILLING MACHINE chuck on the end next to the wheel, upon which there is no wear,being then clamped in position by two bent or U-damps tothe spokes of the wheel or driver. .\ triangular feed-casinggears, worms and worm-wheels ; these admit of feed- Vol. LXI, No. 6. ENGINEERING JOURNAL. 278 ing either way, as the operator may desire. Tools of variousshapes can be made to suit different shaped collars. The machine, shown by fit;. 14. is used for removing thehard adhering crust of lime from the outside surface of boilerflues, which is very difficult to remove in a cleaning roller ortumbler, and expensive as well, because of the waste of steamand time. .V laborer operates the machine, entering the Hues steel cutters, are set obliquely in adjustable boxes, the centralline of the flue passing between them ; these boxes are con-nected with a movable ring, governed by a worm-screw, whichis operated by the lower hand-wheel, and each of them is
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
