. 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 . as far asdesired, but not to exceed a right angle. The obtainableheight of the flange depends entirely upon the thicknessof stock to be used and the expectation as to smoothnessof flanges, and it is always advisable to state all flangingrequirements in detail to the manufacturer, in order tosecure the very best results from a machine. Cutting discs and turning rolls for preparing a seat inlarge tan
. 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 . as far asdesired, but not to exceed a right angle. The obtainableheight of the flange depends entirely upon the thicknessof stock to be used and the expectation as to smoothnessof flanges, and it is always advisable to state all flangingrequirements in detail to the manufacturer, in order tosecure the very best results from a machine. Cutting discs and turning rolls for preparing a seat inlarge tank work of heavy material for receiving a wire;wiring rolls for completing the operation of wiring, andbeading rolls for stiffening and ornamenting the bodies oftanks, vessels, furnace casings, etc., are often applied tothe flanging machine. When these attachments are used,,the flanging yoke is removed. 104 SHEET METAL WORKERS MANUAL DOUBLE SEAMING MACHINES A review of the descriptive matter under BurringMachine (Figure 47) and Setting Down Machine (Fig-ure 49) will prove helpful at this time in understanding ClampingStud- Stud CrankTScrew Depressing(/ Hand Wheelframe SupportingPlate BackGear. Figure 66.—Power Flanging Machine. the uses of the double seaming machine. After the set-ting down machine has done its work, the flange left by itis turned up against the bottom of the vessel, to make boththe seam and the bottom tight. In repair shops this issometimes done with a mallet over the end of the doubleseaming stake. If much work is to be done, a double SHEET METAL WORKING MACHINERY 105- seaming machine will prove a time-saver and will turnout better finished work in a fraction of the time thatwould be required with a hand operation. The flange, as left and closed dowi} with the settingdown machine, is illustrated at A, Figure 67. This flangeat A is turned up against the body of the vessel with thedouble seaming machine, making the seam and bottomtight, as shown at C. Figure 6
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