. 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 . ionof the pipe is to form it into shape on the formingmachine (Figures 35, 36). This machine is easily adjustedby means of the adjusting screws on each end of themachine, and the rolls can be set for forming any desiredsize of cylinder. The upper front roll is slightly raised,to allow the folded edge of the sheet to pass between therolls without closing the lock. The sheet with the foldededge on th
. 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 . ionof the pipe is to form it into shape on the formingmachine (Figures 35, 36). This machine is easily adjustedby means of the adjusting screws on each end of themachine, and the rolls can be set for forming any desiredsize of cylinder. The upper front roll is slightly raised,to allow the folded edge of the sheet to pass between therolls without closing the lock. The sheet with the foldededge on the under side is inserted in the machine just farenough to allow the front rolls to grip the edge, as shownin a, Figure 151. Then holding the handle of the machine SHEET METAL WORK AND PATTERN DRAFTING 171 firmly to keep the sheet in this position, raise the sheet tothe dotted position d, making a slight bend at c. Thisbend enables the sheet to pass easily over the rear roll,giving it the required curve, as shown in Figure 152. The adjustment is made by raising or lowering the rearroll until the required diameter is obtained. A cylinderhaving a grooved seam should be formed a trifle less than. Rear Roll Front RoilFigure 152.—Position of Sheet When Cylinder Is Nearly Formed. its full diameter. This will allow the edges to hook tightlytogether while being grooved. GROOVING SEAMS Having formed the pipe properly, it is now ready forthe grooving operation, which can be performed eitherby hand with the hand groover (Figure 116) and malletover a mandrel stake (Figure 100) or upon the groovingmachine (Figure 40). Operating the Grooving Machine.—After the edges ofthe pipe have been hooked together as shown in a, Figure153, the front latch of the machine is raised and the cylin-der inserted over the grooving horn, the end of thecylinder resting against the lower adjustable stop, whichprevents the work from slipping. The traveling carriage 172 SHEET METAL WORKERS MANUAL is then brought
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