. 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 . evation and Plan of Two-Pieced Conductor Elbow. two-pieced elbow is always found by bisecting the angleand is obtained as follows: With E as center and any convenient radius describethe arc mn. With a slightly larger radius and m and nas centers, describe two arcs, intersecting at H. Thendraw the line HB, which is the bisector of the angle DEF,and EB is the required miter line of the elbow. The upp
. 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 . evation and Plan of Two-Pieced Conductor Elbow. two-pieced elbow is always found by bisecting the angleand is obtained as follows: With E as center and any convenient radius describethe arc mn. With a slightly larger radius and m and nas centers, describe two arcs, intersecting at H. Thendraw the line HB, which is the bisector of the angle DEF,and EB is the required miter line of the elbow. The upper half of the plan is spaced into a number ofequal parts, and from these points vertical lines are SHEET METAL WORK AND PATTERN DRAFTING 259- drawn, intersecting the miter line EB in the stretch-out line as shown by the line ab, is now drawnat right angles to the lower arm of the elbow, and thepatterns for both arms are laid out in the same manneras the 90° elbow. This development is shown fully inFigure 207 and the workman should have no trouble incompleting the problem. Pipe and Roof Flange.—A roof flange used by plumb-ers and sheet metal workers when flashing around vent. Figure 210.—Pipe and Roof Flange. pipes and stacks that come through the slanting sidesof a roof, is shown in Figure 210. As may be seen bythe illustration, the roof flange is merely a flat plate ofmetal which is seamed to a cylinder or pipe having oneend cut at an angle equal to the pitch of the roof. Figure 211 shows the method of developing the pat-tern for the pipe and the opening in the roof plate. Firstdraw the roof line BC at an angle of 45°, which willshow the pitch of the roof. Then draw a side view of the 260 SHEET METAL WORKERS MANUAL.
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