Home instruction for sheet metal workers . aid inside of it, to avoid waste, asexplained in Fig. 520. The vertical strips C, D and E in the elevation, Fig. 544, areshaped to the required circle on the forming rolls in Fig. 522,while the flaring patterns can be formed or rolled on the blow-horn stake in Fig. 521 or the rolls in Fig. 522. The flares for the ball and vertical strips in Fig. 544 need onlybe soldered, but the flares required for the bead, cove and quarterround, numbered 4, 5, 6, 7 and 8, must be tacked with solder,then rivet holes punched in the laps, placing two 1-lb. rivets ineac
Home instruction for sheet metal workers . aid inside of it, to avoid waste, asexplained in Fig. 520. The vertical strips C, D and E in the elevation, Fig. 544, areshaped to the required circle on the forming rolls in Fig. 522,while the flaring patterns can be formed or rolled on the blow-horn stake in Fig. 521 or the rolls in Fig. 522. The flares for the ball and vertical strips in Fig. 544 need onlybe soldered, but the flares required for the bead, cove and quarterround, numbered 4, 5, 6, 7 and 8, must be tacked with solder,then rivet holes punched in the laps, placing two 1-lb. rivets ineach lap, being careful that the laps are placed toward the inside. After the joints are riveted, the rivets as well as the flanges aresoldered to avoid bursting the seam when the strain of raisingand stretching is put on the various flares. The method of rais-ing the 5-in. ball is similar to that explained in raising the except, of course, that a smaller raising hammer will be used Construction and Patterns for a Round Finial 381. Fig. 546. Dressing QuarterMolding. Round and that the concave surface hammered into the block mustcorrespond in size to part of the profile of a 5-in. ball. When preparing the lead block to raise mold 8, Fig. 544, thisshould be done as in Fig. 545, in which B represents a lead block,A the finished flare for mold 8 and the stay is shown in the lowerleft-hand corner, after which flare A is molded. In raising a ball, the concavesurface can be hammered at anypart in the block and is a partof the required size sphere; inraising mold 8 the concave sur-face is usually hammered along acorner of the block, making curvea correspond to the stay, andcurve b c to curve b1 c1 in flareA. This curve or profile ham-mered in the block B represents the shape of the mold into whichthe outside of the flare A is laid and raised with the hammer,striking from the inside. If the distance of the curve in block Bis about 3 in., this will be sufficient. The flare A is r
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
