. 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 75.—Punching Machine. wide variety of sizes and capacities, but for general usethe deep throat punching machine is preferable Figure 75 shows a lever punch having a depth otthroat of 15 inches. It will punch a hole %, & or % inchin diameter, in the center of a 30-inch sheet. It has acapacity for punching as heavy as No. 12 gauge iron(U S. Standard) and when reinforced by the stay bolts 116 S
. 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 75.—Punching Machine. wide variety of sizes and capacities, but for general usethe deep throat punching machine is preferable Figure 75 shows a lever punch having a depth otthroat of 15 inches. It will punch a hole %, & or % inchin diameter, in the center of a 30-inch sheet. It has acapacity for punching as heavy as No. 12 gauge iron(U S. Standard) and when reinforced by the stay bolts 116 SHEET METAL WORKERS MANUAL in the frame of the machine it will punch No. 9 gauge ironand lighter. A heavier and larger punch of similar design is madefor punching a %-inch hole in %-inch iron; and by theuse of special punches in the heavier machine largerholes can be punched, from y2 to 1*4 inches in diameter,in sheet iron ranging in thickness from y% to *4 inch. ■ Figure 76 shows a useful combined shears and punch,having a depth of punching gap of 2% inches. This ma- Hand Lever. ■Upper Cutting BladeFrame9 V^- LowerCutting Blade Figure 76.—Combined Shears and Punch. chine will center sheets 5y2 inches wide and will punch a%> A? %> t56> or %-inch hole in iron ^ inch thick. Thecutting blade is 4% inches in length and will cut sheetiron ys inch thick and narrow bars <£$ and % inch. Combined shears and punches somewhat different inconstruction are also built for heavy duty, with a punch-ing capacity as great as %-inch hole in %-inch iron, andwill cut sheet iron No. 8 gauge (U. S. Standard) and bariron ^4x1%, %x%, or y2 inch square. The notching machine, Figure 77, is constructed fornotching blanks of pieced sheet metal ware, for cuttingthe corners of square pans, hinged notches of boxes, and SHEET METAL WORKING MACHINERY 117 similar work. The dies are made in sections, so that theymay be easily sharpened and reset. The notching machinehas ample gauging capacity
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Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
