Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . center is usually gauged by eye and ordinarilythis is near enough to the center. A small center puncharrangement which is illustrated in Fig. 120 B, has re-cently been described in one of the technical is intended to center punch the stay bolt exactly in thecenter. In the first place, before the stay bolt has beenput into place, the tit T, Fig. 120 A, is entered into thestay bolt hole, and the punch is hit with a hammer, so asto make two little marks diametrically opposite eachot
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . center is usually gauged by eye and ordinarilythis is near enough to the center. A small center puncharrangement which is illustrated in Fig. 120 B, has re-cently been described in one of the technical is intended to center punch the stay bolt exactly in thecenter. In the first place, before the stay bolt has beenput into place, the tit T, Fig. 120 A, is entered into thestay bolt hole, and the punch is hit with a hammer, so asto make two little marks diametrically opposite eachother. After the stay bolt has been riveted over, thepunch arrangement, Fig. 120 B, is set into these holesand the center punch hit with a hammer, thus locatingthe center of the stay bolt. Turning and Boring. A dome flange like the one on Plate 2 has a greatadvantage over the style, Plate 5, on account of machin-ing the different parts. They are very quickly put to- 152 More about dome flanges. gether in the former. In Fig. 121 will be seen one ofthese flanges. It is made of 134-inch steel plate. The. / Figure 121Machining dome flange. radius R of the die is the same for flanges which are tofit a boiler having a radius R2, which may be several i53 Domes on slope sheet. inches more than the flange radius. R2 is machined outand the limit of this radius is such that the sheet mustnot be less than ^ of an inch along the lower edge. Thelimit of the radius R is to give Yz at the top portion ofthe flange. The flange is mounted on the boring milland is turned out on the inside to a diameter D1} which is% of an inch larger than D2. This is only machined deepenough for the seam. The outer edge of the flange at
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Keywords: ., bookcentury1900, bookdecade1910, bookidlocomotivebo, bookyear1912
