. 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 . —Common Funnel, in Which Both Body and Spout AreFrustums of Cones. much extra work can be avoided by drawing only one-halfof the elevation, as shown, on one side of the center lineAB. This is done to simplify the work and to avoid thedrawing of unnecessary lines. To develop the patterns,extend the side lines of the body and spout until they in-tersect the center line at M and G. For the pattern for
. 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 . —Common Funnel, in Which Both Body and Spout AreFrustums of Cones. much extra work can be avoided by drawing only one-halfof the elevation, as shown, on one side of the center lineAB. This is done to simplify the work and to avoid thedrawing of unnecessary lines. To develop the patterns,extend the side lines of the body and spout until they in-tersect the center line at M and G. For the pattern forthe body proceed as follows: With g as center and radii equal to GF and GE, de-scribe the arcs ee and // of the pattern. On the arc eestep off four times the number of spaces contained in thequarter plan C; then draw lines to the center g. Addlaps for seaming and wiring. The pattern for the spout is developed in a similar SHEET METAL WORK AND PATTERN DRAFTING 237 manner, with a lap added to the upper edge and side forsoldering. After the pattern has been cut from metal, notch thecorners, and turn the edge for the side seam on the fold-ing machine. When the outline of the pattern is a semi-. Pattern for Spoof f Figure 196.—Patterns for Funnel Body and Developed by theRadial Method. circle or larger, place the work in the folder and bendthe edge to a right angle, then finish the operation bymeans of the mallet on the hatchet stake. The patternsare now formed on the blowhorn stake, after which theside seam of the body is grooved and the upper edge iswired in the same manner as described in the preceding 238 SHEET METAL WORKERS MANUAL problem. The spout is slipped over the lower end of thefunnel and soldered in position, as shown at h. Flaring Liquid Measure.—Another application of theprocesses of wiring and seaming of flaring articles is theconstruction of flaring measures. These measures areusually made from bright tin, having & wire inclosed inthe upper edge, and t
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