Home instruction for sheet metal workers . ice position of students hands, and how the flare and ham-mer is held in Fig. 526. The buckles in Fig. 527 are beingsmoothed on block B, while Fig. 528 shows how the raised flare is dressed free from all marksor dents by using the woodmallet on the round headstake C. The latter is fas-tened to bench D by havingthe proper size square hole cutin it or by having a cast-ironbench plate fastened to thebench, Fig. 529. These benchplates can be obtained withpolished surface, and haveholes for screwing to a bench, and with different size holes forholding stak
Home instruction for sheet metal workers . ice position of students hands, and how the flare and ham-mer is held in Fig. 526. The buckles in Fig. 527 are beingsmoothed on block B, while Fig. 528 shows how the raised flare is dressed free from all marksor dents by using the woodmallet on the round headstake C. The latter is fas-tened to bench D by havingthe proper size square hole cutin it or by having a cast-ironbench plate fastened to thebench, Fig. 529. These benchplates can be obtained withpolished surface, and haveholes for screwing to a bench, and with different size holes forholding stakes, bench shears, etc. They come in different sizes,contain more or less holes and can be obtained from dealers insheet metal workers tools. Notice how the operator holds thework and tool. In this manner all the flares should be raised and it might bewell to add that in raising always start at the seam, for then thestudent knows where to start and finish his courses of mistake which the student is liable to make is to strike too. BenchFig. 532. Testing Hemisphere. 368 Home Instruction for Sheet Metal Workers hard, resulting in the flare being too round or of greater depththan called for by stay B°, Fig. 524. Each and every flare mustbe raised true to the stay, otherwise when the ball is soldered to-gether it will not represent a true sphere. If the flares are notraised deep enough, which, however, does not happen very c. ften,the ball will have a pointed shape when soldered together, whileif the flares are raised too deep, which very often occurs, the ballwould look as in Fig. 530, in which the depths of the flares areexaggerated. Assuming that all flares have been raised true to the stay, theyare joined together as in Fig. 531, in which the three operations
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
