. 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 47.—Burring Machine. required for holding the work in proper position, andafter this is learned a proper and uniform speed is neces-sary to produce an edge or flange without buckling. SeeFigures 172-177. The burring machine is used for creasing, edging rimsof covers for pails, boilers, etc., and preparing circularedges of bottoms and bodies of vessels for double preparing vessels
. 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 47.—Burring Machine. required for holding the work in proper position, andafter this is learned a proper and uniform speed is neces-sary to produce an edge or flange without buckling. SeeFigures 172-177. The burring machine is used for creasing, edging rimsof covers for pails, boilers, etc., and preparing circularedges of bottoms and bodies of vessels for double preparing vessels for double seaming, a burr is firstturned at a right angle on the body of the vessel (seeFigure 48) ; then one of nearly the same width is turned 88 SHEET METAL WORKERS MANUAL beyond a right angle around the edge of the bottom. Thebody is sprung into the last named burr. The vessel is j L J L Figure 48.—Three Successive Operations for Double Seaming; also aBottom Flange, Turned on the Burring Machine^ Crank Screw Upper SettingDown Rolland Gear hand Crcrnk. Lower SettingDown Roll and Gqar Tenaion Spring Figure 49.—Setting Down Machine. then ready for setting down (see Figure 48), using thesetting down machines, Figures 49, 52. To turn the burron the body of the work is not very difficult, but to turn SHEET METAL WORKING MACHINERY 89 an even burr on the bottom without crimping the burr orwarping the bottom requires both teaching and practice. The burring machine will also turn flanges on bottomsor discs, as shown in Figure 48. The machine described has a working capacity of gauge iron and lighter (U. S. Standard), and is man-ufactured in a small size with rolls iy2 inches the small machine the widest flange or burr that canbe turned is TVinch. The larger machine has rolls meas-uring 2% inches diameter and the widest flange or burr A«S? 5>A B< B Figure 50.—Edge Turned by Bur-ring Machine. Figure 51.—Edges Closed on Set-ting Down Machine. that c
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