Home instruction for sheet metal workers . i in. flange as in E\ diagram X, or 38in. x 3^8 in. The pattern for the ring F1 in diagram X isobtained by using as radii W X and W Y in elevation and with 380 Home Instruction for Sheet Metal Workers L on the center line A B as center, describe the arcs X1 X2 andY1 Y2, being careful that the radial lines Y2 L and L Y1 form aright angle. Add the outer edge shown by the dotted line, asin diagram X, and add a lap to one end of the pattern at X1 X1 Y1 Y2 X2 will be the one quarter pattern for the ring,four of which will be required to complete th
Home instruction for sheet metal workers . i in. flange as in E\ diagram X, or 38in. x 3^8 in. The pattern for the ring F1 in diagram X isobtained by using as radii W X and W Y in elevation and with 380 Home Instruction for Sheet Metal Workers L on the center line A B as center, describe the arcs X1 X2 andY1 Y2, being careful that the radial lines Y2 L and L Y1 form aright angle. Add the outer edge shown by the dotted line, asin diagram X, and add a lap to one end of the pattern at X1 X1 Y1 Y2 X2 will be the one quarter pattern for the ring,four of which will be required to complete the full circle. The student should now transfer the paper patterns to themetal, and if, for example, pattern for 8 were being transferred,then all that is necessary to prick through are the points i j fi and the center point M1. The paper is removed, and, usingdividers or sheet metal trammel as explanned in Fig. 519, arcsare struck. When cutting the flaring patterns, the largest flare should be. Fig. 545. Raising Quarter Round Molding. cut first, and the smaller ones laid 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 ra
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
