. 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 . ders, but perfect wiring with the wiring machine ispossible with or without the use of the forming gauge,and when not required it is easily detached. The wiring machine described has rolls measuring 3inches diameter and is practical for wire up to ^-inchdiameter, with a capacity of No. 22 gauge iron and lighter(U. S. Standard). The manufacturer offers larger andheavier wiring machines intended for
. 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 . ders, but perfect wiring with the wiring machine ispossible with or without the use of the forming gauge,and when not required it is easily detached. The wiring machine described has rolls measuring 3inches diameter and is practical for wire up to ^-inchdiameter, with a capacity of No. 22 gauge iron and lighter(U. S. Standard). The manufacturer offers larger andheavier wiring machines intended for heavy work andunusually large size wire, hand or power operated; andin such machines the rolls are interchangeable for per-forming the operations of wiring or turning on the samemachine. SHEET METAL WORKING MACHINERY 87 Burring Machines.—While a little practice will pro-duce very satisfactory results and make good wiring pos-sible with the use of the wiring and turning machines, asalready described, the burring machine (Figure 47) ismore difficult to operate, and any attempt to use theburring machine without a teacher would result in awaste of time and not a little spoiled work. A knack is. 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
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