. 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 . de range of sizes and of unusuallylarge lengths. The folding machine can only form a lockor edge as wide as the depth of the jaw in the machinewill permit; whereas, the brake allows the sheet of metalthat is to be edged or formed to pass through the jawsfrom front to back without obstruction. A comparison may be made at this time of the foldingmachines illustrated in Figures 15 and 17. In operating
. 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 . de range of sizes and of unusuallylarge lengths. The folding machine can only form a lockor edge as wide as the depth of the jaw in the machinewill permit; whereas, the brake allows the sheet of metalthat is to be edged or formed to pass through the jawsfrom front to back without obstruction. A comparison may be made at this time of the foldingmachines illustrated in Figures 15 and 17. In operatingthe folding machine the sheet of metal to be worked isinserted under the folding blade and by raising the fold- 58 SHEET METAL WORKERS MANUAL ing bar and pulling the bar towards the operator the lockis formed. The folding machine throwing the sheettoward the operator in the forming of the lock, edge, orangle, is not at a disadvantage when working small pieces,but where the sheets are large the brake invariably provesa more convenient means for edging. In operating thebrake the sheet to be edged rests on a bed and when it Folding Bladefolding Bar-Pin GaugeAdjuster ^6et6crew AdjustableStop Pin. Key Wrench TreadleRods andTurnbuckle Treadle Spring Toot Treadle Figure 23.—Open Throat Folding Machine. is m a proper position, ready for edging, the material issecurely clamped and remains in a fixed and stationaryposition while the bend is made. Open Throat Folder,—The construction of the brakeand of the open throat folder provides for edging sheetmetal as described. Figure 23 illustrates a modern type of open throat SHEET METAL WORKING MACHINERY 59 folder which operates similarly to the floor brake, or whatis better known as the cornice brake (Figure 24).
Size: 1541px × 1621px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
