. American engineer and railroad journal . tie when applied and not left for the train to settle to posi-tion, thus exposing it to the liability of sand and gravel to getunder to bend it. It should be so punched as to secure a snug lit toavoid any lateral movement of the rail, and the spikes should bedriven vertically. New Armstrong1 Pipe-Threading Machine. The machine which we illustrate in the accompanying engrav-ing is the outcome of frequent calls received by The ArmstrongManufacturing Company, for a machine threading from i to 2-iuch pipe, and the usual desire of that company to turn out
. American engineer and railroad journal . tie when applied and not left for the train to settle to posi-tion, thus exposing it to the liability of sand and gravel to getunder to bend it. It should be so punched as to secure a snug lit toavoid any lateral movement of the rail, and the spikes should bedriven vertically. New Armstrong1 Pipe-Threading Machine. The machine which we illustrate in the accompanying engrav-ing is the outcome of frequent calls received by The ArmstrongManufacturing Company, for a machine threading from i to 2-iuch pipe, and the usual desire of that company to turn out atool for this purpose superior in construction and operation toany heretofore manufactured. It will be known as the Armstrong No. 0 pipe-threadingmachine and uses the well-known regular Armstrong adjustabledies which are put in the machine and adjusted in the samemanner as in the hand stock. These dies can be opened aftercutting a thread, and when the pipe is removed they may belocked back to the standard size without re-setting. This is. The New Armstrong Pipe Machine. accomplished by an automatic locking device which is operatedby simply pulling a knob. The dies, however, can be adjusted tothe variations of the fittings, the same as in the stock. All the gears and moving parts of the machine run in oil, beingenclosed in a chamber which covers and protects them from chipsand dust, doing away with any possible chance of chips and dirtgetting into the gears. The machine is self-oiling in all its parts,oil being admitted through two holes which are closed by screwplugs. The die head has no teeth on the part where it fits intothe shell and forms a bearing; in this way its bearing surface ispreserved and it is impossible to work loose, a common occur-rence with some makes of pipe-threading machines. In addition to the die-carrying head forming a bearing in themanner shown, it has an inner journal, thereby increasing itswearing surface. A very powerful self-centering vise, which ex
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
