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 . rkoff the holes for the angle on to the waste sheet. If the angle-iron projects, or the sheet projects beyond the angle, lay offa line on the sheet so that when this is sheared off the wholething will present a neat appearance. Remove the clampsand trim off the extra metal from the sheet. Set the angle-iron against the boiler a little to the front, so that when theboiler is heated up it will stand a little to the back, depending
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 . rkoff the holes for the angle on to the waste sheet. If the angle-iron projects, or the sheet projects beyond the angle, lay offa line on the sheet so that when this is sheared off the wholething will present a neat appearance. Remove the clampsand trim off the extra metal from the sheet. Set the angle-iron against the boiler a little to the front, so that when theboiler is heated up it will stand a little to the back, dependingupon the amoujit of expansion required at this point. HOW TO LAY OUT A LOCOMOTIVE BOILER lOI The guide bearer sheet. Fig. 143. rigidly ties together theframes, guide bearer, and boiler. This illustration shows :isingle sheet extending clear across the guide bearer. Thiscan often be seen on medium size boilers. On very largelocomotives the shell comes down close to the frame, so thatthe guide bearer must be cut out to clear the boiler. In thiscase two guide bearer sheets will be used instead of one. Iheyare placed out near the end of the guide bearer, and extena. FIG. radically against the boiler. The expansion of the boilerat this point is not much. This is a good thing, as thesesheets often get to be very narrow, and could not deflect muchwithout straining the parts. The radius R of the sheet is made from ^ to K inch largethan that of the boiler. Place the sheet in part against bearer, and fasten it with several clamps. Measure upto see that the projection on either side is the same, andbump the sheet one way or the other so as to bring it off the holes H from the guide bearer. Place the angle-iron A in position. Fit this to the boiler as in Fig. 142, andmark off the holes K. Scribe off any projection there may beof the angle beyond the sheet, or of the sheet beyond theangle. The sheet can now be taken down and sheared tothese lines, and the holes c
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
