. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . iety of work,and are well adapted for turning edges on heavy material,preparing the edges of flaring articles for wiring, edgingpieced elbows, and making a depression or bead on themetal when marking the width of a flange to be turned ona cylinder or cover. Flanging the Cover.—After the cover has been ham-mered or raised into shape, it will be necessary to turn awide edge or flange on the rim, to a
. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . iety of work,and are well adapted for turning edges on heavy material,preparing the edges of flaring articles for wiring, edgingpieced elbows, and making a depression or bead on themetal when marking the width of a flange to be turned ona cylinder or cover. Flanging the Cover.—After the cover has been ham-mered or raised into shape, it will be necessary to turn awide edge or flange on the rim, to allow for joining thehoop and cover by means of a single seam shown at A,Figure 181. The first step in flanging is to set the gauge 218 SHEET METAL WORKERS MANUAL on the turning machine (Figure 43) about % inch fromthe edge of the upper roll. Next, place the edge of thecover against the gauge, bring down the upper roll, andrevolve the work in the machine, making a depressionor bead as shown at number 1, Figure 183. Then invertthe cover and place the flange on top of the square stake,in the position shown at 2; after which the edge is ham-mered down evenly by means of the wooden mallet. This. Figure 183.—Method of Flanging a Pail Cover. completes the operation, leaving a flat surface % inchwide around the edge of the cover as shown at number means of the small burring machine (Figure 47), a%-inch edge is turned on the cover, as shown at number cover is now hooked over the edge burred on the hoop,and the seam closed down by means of the setting ham-mer. The ring for the cover is made from a piece of metaliy2 inches long and y2 inch in width, as shown at G,Figure 181. A single edge is turned on both sides, and SHEET METAL WORK AND PATTERN DRAFTING 219 the metal strip is formed into shape over the round endof the needle case stake (Figure 98). The ring is thensoldered in position, which completes the construction ofthe cover. Forming Wire Bails.—The small malleable
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Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
