. 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 . d in thebench by inserting the prong in the bench plate, Figure95, or a hole of the proper size cut in the bench for thispurpose. This shears has a right-hand cut, with the lowerblade on the right side of the shears. Note the differencein the position of the upper blades in the right handshears in Figure 103, and the right hand bench shears inFigure 102. 156 SHEET METAL WORK AND PATTERN DRAFTING 15
. 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 . d in thebench by inserting the prong in the bench plate, Figure95, or a hole of the proper size cut in the bench for thispurpose. This shears has a right-hand cut, with the lowerblade on the right side of the shears. Note the differencein the position of the upper blades in the right handshears in Figure 103, and the right hand bench shears inFigure 102. 156 SHEET METAL WORK AND PATTERN DRAFTING 157 The double cutting shears, shown in Figure 108, isadapted to cutting off round and square pipes, bottoms ofpails, cans, etc. A hole is punched in the article to becut, and the point of the lower blade inserted, after whichthe cutting is done in the regular manner, leaving theedges clean and smooth. Squaring Shears.—Figure 1 ( Sheet Metal WorkingMachinery) shows a modern squaring shears which isrecommended for this course in cutting strips, squaringtin, and making long straight cuts across sheets of metalwhen shearing material for the construction of pipes andarticles cylindrical in Figure 140.—How to Cut Circles to Avoid Waste of Metal. If the shears do not respond in cutting material ofheavier gauges within the rated capacities claimed by themanufacturer, the blades should be set farther lower blade must be set back from the upper, thoughnot far enough to burr the edge of the material. Thisadjustment can be made by releasing slightly the bedbolts that hold the bed of the shears to the legs, and byloosening the two front bed screws. The bed can thenbe shifted on its seat towards or away from the uppercutting blade until the proper position is secured. The blades can be easily removed for grinding, and 158 SHEET METAL WORKERS MANUAL when dull they should be returned to the factory forgrinding. After being ground they are fastened securelyto their frames an
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