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 . ck, ly^ and iM inchesas shown. Draw the center line CC and lay out the outline ofthe group of holes as shown. Draw the parallel lines for the stay-bolt holes to the di-mensions given. Mark out all these holes and then lay offthe four wash-out plug holes, and strike a circle to correspondwith the tap called for. These holes must be drilled a special now TO LAY OUT A LOCOMOTIVE BOILER 83 diameter as they come on the curve, and whe
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 . ck, ly^ and iM inchesas shown. Draw the center line CC and lay out the outline ofthe group of holes as shown. Draw the parallel lines for the stay-bolt holes to the di-mensions given. Mark out all these holes and then lay offthe four wash-out plug holes, and strike a circle to correspondwith the tap called for. These holes must be drilled a special now TO LAY OUT A LOCOMOTIVE BOILER 83 diameter as they come on the curve, and when the sheet istent the outside will open up. Therefore, care must be takento have sufficient metal so as to have full threads. STAYING FIRE-BOX SHEETS. The layout of the inside and outside fire-box sheets has nov?been given, but nothing has been said in regard to the con-nections and details of these sheets. There are many methodsof staying the various sheets of a locomotive boiler, and anumber of the methods which are in common use will beshown. Not all the surfaces of the locomotive boiler need to bestayed. The outside cylindrical sheets will keep their shape. riveted over cold, in place. Such renewals are not easilymade. All the stays which have just been mentioned areround stays. The front and back head are often stayed withplates, bar iron, and numerous patented shaped braces, as theHuston, McGregor, etc. Fig. 55 shows the common form of stay-bolt which is usedaround the fire-box. These stays are machined in standardlengths, varying by 5^ inch for short stays and several inchesfor long stays. They are turned down in the center at A orelse upset from rough bar iron at a diameter equal to A so asto give the necessary thread on each end. In Fig. 56 is illus-trated one of these stays just after it has been screwed intoplace. It is nicked at A^ by hand and is then broken off, or isthen clipped off with pneumatic stay-bolt clipper. The stay-bolt is cut off inside and outside, le
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
