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 . inches in diameter and lay off twelveequal spaces for the clamps. The hinge is made up of a strapand block. The strap is forged to fit the door and is riveted as shown in Fig. 98. An angle-iron is sometimes used for thispurpose. As few boiler shops, however, have angle-bendingrolls for bending these angles, the solid ring is preferred. Inaddition to this the solid ring makes a stiff, strong front end,and this is desirable, as a
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 . inches in diameter and lay off twelveequal spaces for the clamps. The hinge is made up of a strapand block. The strap is forged to fit the door and is riveted as shown in Fig. 98. An angle-iron is sometimes used for thispurpose. As few boiler shops, however, have angle-bendingrolls for bending these angles, the solid ring is preferred. Inaddition to this the solid ring makes a stiff, strong front end,and this is desirable, as a smoke-box brace is usually at-tached near this ring. It is faced on the outside diameter andon the front, as shown by the finish marks f, Fig. 98. The smoke-box is 54 inches in diameter, and the ring is3/4 by 3 inches in the roUgh, or zVk by 27-^ inches smoke-box sheet is kept back K inch from the edge so asto give an edge for calking. Fifteen-sixteenth-inch holes aredrilled through the ring for ^-inch rough bolts. The illustra-tion shows button-head rivets inside and outside. Oftentimesthese heads are countersunk on the outside, and in. to it; the block is turned off so that it will pass through thedoor in the form of a stud, and is held in place by a nut onthe inside. The ring R is made of forged steel and is faced off on theouter edge and outside diameter only. Twenty-four holes arelaid off to suit the smoke-box front, and forty-eight J^-inchrivets are required for the fire-box sheet. These will be laidoff between the center lines as shown, i 7-16 inches from theouter edge. The drawing calls for ^-s-inch rough bolts, and,therefore, the holes will have to be drilled i-16-inch there are a number of boilers to be built with the samesize front, a sheet-iron gauge would be made, and with thisgauge the holes would be laid out, both on the smoke-boxfront and on the smoke-box front ring. The alinement of theholes is thus more certain, and the work
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
