. 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 . Figure 146.—Double Hemmed Edges. formed in the folder in the same manner as the singleedge. After the latter is formed, the sheet is turned over,. Figure 147.—Wire Edge, Open and Closed. then the single edge is placed in the machine against thegauge and the operation is repeated. Wire Edge.—It is often necessary to increase the SHEET METAL WORK AND PATTERN DRAFTING 165 strength of articles made fro
. 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 . Figure 146.—Double Hemmed Edges. formed in the folder in the same manner as the singleedge. After the latter is formed, the sheet is turned over,. Figure 147.—Wire Edge, Open and Closed. then the single edge is placed in the machine against thegauge and the operation is repeated. Wire Edge.—It is often necessary to increase the SHEET METAL WORK AND PATTERN DRAFTING 165 strength of articles made from sheet metal by inclosing awire in certain of their edges. The edges for this pur-pose must be rounded as shown in Figure 147. To forman open or round lock for wiring, set the gauge on the
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Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
