. American engineer . ~T . I 1 , Fhr Section 21—Beading T( ol for Tubes 5-32 Ir Mandrel. Too/ $/ee/. Temperec/.Fig. 22—Mandrel for Large Sectional Expanders. Fig. 21 is operated with a short stroke air hammer. The rollerexpander and mandrel for setting the front end of the 20, is operated with an air machine. This tool is of the in the outside sheets opposite the arch tubes. These plugs aretapered 54 in. in 12 in., and have llji threads per inch. Be-cause of the thickness of this tube it is found desirable to bevelthe inner edge to facilitate beading. At the throat sheet en
. American engineer . ~T . I 1 , Fhr Section 21—Beading T( ol for Tubes 5-32 Ir Mandrel. Too/ $/ee/. Temperec/.Fig. 22—Mandrel for Large Sectional Expanders. Fig. 21 is operated with a short stroke air hammer. The rollerexpander and mandrel for setting the front end of the 20, is operated with an air machine. This tool is of the in the outside sheets opposite the arch tubes. These plugs aretapered 54 in. in 12 in., and have llji threads per inch. Be-cause of the thickness of this tube it is found desirable to bevelthe inner edge to facilitate beading. At the throat sheet endof the tube a short radius is generally used to carry the tube. eBead/n^.Front or Throat Stieei 23—Arrangement for Securing Brlcl< Arch Tubes. self-feed type. The mandrel used with the expanders shown inFigs. 18 and 19 is illustrated in Fig. 22, and is operated with along stroke riveting hammer. A proposed setting of brick arch tubes is shown in Fig. 23. away from the fire as quickly as possible. This is more desir-able with a shallow depth Tubes are swaged down onboth ends to permit using as small a hole as possible, and atthe same time one size roller expander may be used for both January, 1913. AMRRICAN ENGINEER. 29 ends. Ill using the rullcr cxpaiiders a copper ferrule must beplaced in the threaded plug hole in the outside sheet to preventthe threads from being injured by the expander guide. The sectional expander for seating the copper ferrule in theflue sheet, which can be used only from the firebox side of thesheet, is shown in Fig. 24. As previously noted the mandrelshown in Fig. IS is used with this expander. A rol
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
