Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . us at the point X is also Sy2 inches and thefigures at this point will be used in making the construc-tion to determine the neutral line B. The point thus de-termined gives the least width of the sheet. The radiusat y and z is 6 inches and the construction is made todetermine the length of the neutral line C and D. Thesedistances are laid off to suit and thus the right and lefthand sides of the sheet are determined. One thing should be mentioned here in reference tothe lower corner of this s
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . us at the point X is also Sy2 inches and thefigures at this point will be used in making the construc-tion to determine the neutral line B. The point thus de-termined gives the least width of the sheet. The radiusat y and z is 6 inches and the construction is made todetermine the length of the neutral line C and D. Thesedistances are laid off to suit and thus the right and lefthand sides of the sheet are determined. One thing should be mentioned here in reference tothe lower corner of this sheet. The angle between thewater space frame and the throat sheet, immediately infront, is 90 degrees, which would seem. to indicate thatthe development of the lower portion of the sheet wouldbe a straight line. It would be if, during the process offlanging, the portion of the sheet marked T would bestretched. This is not the case however, and the lengthT before and after flanging will be the same. For thisreason the distance P is laid off in Fig. 21 to correspond 65 Fire box throat sheet. -±?-4. 66 Fire box throat sheet. to the length of the neutral line at P in Fig. 20, and thelength T is laid off from the point thus determined. Thisbrings a point on the corner of the sheet as indicated. There will be some stretching action somewherealong the curved line here shown and it is found that aradius thrown in at this point will come better whenflanged than it would if a straight line was worked this reason a radius should be struck at this placeas shown. The flange of this sheet is very long at X andon account of the upsetting action of the sheet at thispoint, the metal will flow and be drawn by the actionof the press, so that there will be a considerable 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 freq
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Keywords: ., bookcentury1900, bookdecade1910, bookidlocomotivebo, bookyear1912
