Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . erable bunchingup of the sheet at this point. On this account a semi-circular piece is cut out as shown at E and for a sheetof this size E would be 1^ inches. No holes will be putin this sheet before flanging, although it is frequentlylaid out and all the holes counter punched. After flang-ing, the sheet is taken to the laying out table and meas-ured up. Wherever the sheet has drawn, the old center ishammered shut and a new center put in to the correctfigure. The three bridges marked H in Fi
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . erable bunchingup of the sheet at this point. On this account a semi-circular piece is cut out as shown at E and for a sheetof this size E would be 1^ inches. No holes will be putin this sheet before flanging, although it is frequentlylaid out and all the holes counter punched. After flang-ing, the sheet is taken to the laying out table and meas-ured up. Wherever the sheet has drawn, the old center ishammered shut and a new center put in to the correctfigure. The three bridges marked H in Fig. 21 must beallowed to remain, together with the central portion ofthe sheet, in order to hold the sheet together duringflanging. Fire Box Throat Sheet. Fig. 22 shows the fire box throat sheet of a Wootei?boiler as seen on Plate 2. Draw the center line C-C inthe center of the sheet and then from the figures on thedrawing locate the center line D-D. The center of theboiler will be at the intersection of these two lines. Thelower portion at the water space frame will be 49% 67 Fire box throat 68 Layout of fire box throat sheet. inches from the center line D-D. There will be a flatportion at the bottom, and then a slope line for a dis-tance of 6 inches, then again a flat portion at the will be laid off to suit the figures on the sectional view of this throat sheet is shown on theright hand side of Fig. 22. The height of the flangemarked A, together with the radius and the thicknessof the sheet, is laid down along the center line C-C. Thelength of the neutral line B will be obtained by themeasuring wheel and laid off along the center line asshown. This represents the developed position of thelower portion of the flange at the bottom center. The2^-inch radius will extend all the way around thethroat sheet until it disappears in the flat portion of theflange at the top of the sheet. The inside flange willhave the same width all the way round. The inside l
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Keywords: ., bookcentury1900, bookdecade1910, bookidlocomotivebo, bookyear1912
