Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . a longitudinalseam for the crown sheet connection. On a much larger for 2j4-inch space, start at the top rivet along the left-handline and step off one space after another and see if the bottomrivet comes out far enough above the water-space frame toclear the head. This will rarely come out exactly right; wenow either increase or decrease the space of the dividers andmake another trial. This will be repeated until the last rivet
Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . a longitudinalseam for the crown sheet connection. On a much larger for 2j4-inch space, start at the top rivet along the left-handline and step off one space after another and see if the bottomrivet comes out far enough above the water-space frame toclear the head. This will rarely come out exactly right; wenow either increase or decrease the space of the dividers andmake another trial. This will be repeated until the last rivetcomes exactly right. All the points will now be center-punched to suit the last spacing. In a similar manner we lay out the rivets along the right-hand edge of the sheet as nearly 2^-inch pitch as the evenspacing of the rivets will allow. Draw two lines parallel tothe lower edge of the mud-ring rivets. The drawing calls forthirty-seven equal spaces between the first through rivets inthe corners. Measure off the length of this line, divide thisdistance by the number of spaces and get the pitch of therivets. Set the dividers as near this distance as possible and. Fig. 30 Pig. 31 plate than the one that has been ordered for this sheet, wemake a large layout of the fire-box, showing mud ring andfront and back tube sheet. This will be used after the frontand rear sheets have been flanged to lay out the rivet holesin these flanged holes. Having made this layout as shown inFig. 28, that portion which pertains to the side sheet itself canbe transferred to the actual sheet. Fig. 29, upon which thislayout is to be made. Draw a line along the top of the sheet,allowing about % inch for. planing, measure up the length andwidth from the large layout and find the best position on thesheet. Draw a parallel line i inch from the top for the longi-tudinal seam; also draw lines parallel to the edges, front andrear i inch from the edge of the sheet for the fire-box seamrivets. The boiler card calls
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
