. 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 . is done on the small turning machine (Figure 43),in the following manner: Having made an allowance of ^4 inch to the edge ofthe pattern for a No. 12 wire, set the gauge on the machine!/4 inch from the center of the depression in the lower placing the upper edge of the pan against the gauge,bring down the upper roll and revolve the work in themachine, making a deep depression or b
. 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 . is done on the small turning machine (Figure 43),in the following manner: Having made an allowance of ^4 inch to the edge ofthe pattern for a No. 12 wire, set the gauge on the machine!/4 inch from the center of the depression in the lower placing the upper edge of the pan against the gauge,bring down the upper roll and revolve the work in themachine, making a deep depression or bead on the metal. 234 SHEET METAL, WORKERS MANUAL Kun the work through the machine several times, gradual-ly raising the work until the edge is turned to the re-quired angle, which will bring the side of the pan to a ver-tical position, almost touching the upper roll. When turning a wire edge on the turning machine, itis often a difficult matter to keep the work circular inform; this difficulty can be overcome by pulling the workand rounding it into shape as it passes through the ma-chine. The edging operation and the position of the workmanwhile operating the machine is shown in Figure Figure 194.—Wiring a Flaring Article, Showing Correct Position of the Hands. Use of Wiring Machine.—After turning the edge forwire, we are ready for the wiring process, which is theaame as that described in Chapter VII, except that thewire is formed in the rolls before being inclosed in theedge of the article. First cut a piece of wire about y2inch longer than the circumference of the top of the panand form it circular in shape on the forming rolls (Fig-ures 35, 36). Then placing one end of the wire at theside of a vertical seam and under the wire edge, closethe metal over the wire for a short distance from theend by means of the hammer and the horn on the standardof the machine, or some suitable stake. SHEET METAL WORK ANB PATTERN DRAFTING 235 After setting the gauge on the wiring mac
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