. 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 . rally constructed in theform of a flat cone, while the smaller sizes are either ma-chine stamped or raised into shape from the flat metal bymeans of the raising hammer shown in Figure 110. Rais-ing hammers can be obtained in different sizes and weightssuitable for the work in hand. Template for Hoop.—The method of laying out the pat-terns and the construction of the one-quart pail cover isshown in
. 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 . rally constructed in theform of a flat cone, while the smaller sizes are either ma-chine stamped or raised into shape from the flat metal bymeans of the raising hammer shown in Figure 110. Rais-ing hammers can be obtained in different sizes and weightssuitable for the work in hand. Template for Hoop.—The method of laying out the pat-terns and the construction of the one-quart pail cover isshown in Figure 181. A detailed section showing the con-struction is given at A, The template, or pattern, forscribing the arc of the flaring hoop is shown at B, and ismade in the following manner: Using a piece of heavy tin 20 inches long, turn a double 214 SHEET METAL WORKERS MANUAL hem on one side; locate points d and e 1% inches fromhemmed edge as shown by ef; then with the trammelpoints, using a 36-inch radius, scribe an arc from d to metal is now cut on this line and a ^-inch holepunched near one end for hanging the template on thewall for future use. This template can be used for mark-. Figure 181.—Patterns and Construction of One-Quart Pail Cover. ing out hoops of any diameter. For large covers the hoopcan be made in two or more pieces. The hoop for the one-quart pail cover is made from onepiece of metal, equal in length to the circumference of thebody, and is laid out directly on the metal as shown at one or a dozen pieces are required, set the pointsof the wing dividers equal to the width of the hoop. Thenstart at the lower edge of the sheet and mark the width ofeach hoop by making a light impression on the metal withthe point of the dividers, as shown at mm on both ends of SHEET METAL WORK AND PATTERN DRAFTING 215 the sheet. The template B is now placed on the loweredge of the sheet with the rounded side touching the cor-ners. Then using the scratch awl, s
Size: 1818px × 1374px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
