By: Arthur Cooper
Submitted: 2011-05-23 12:17:59 | Word Count: 664
Shearing is the process of cutting sheet metal out of a larger stock to the appropriate size for your job. Most shearing equipment is used in sheet metal industries for workers in construction and manufacturing. Most of these industries require on the job training so learning the proper use of shears and other industry equipment is imperative.
Sheet metal workers commonly manufacture and install ventilation, heating and air-conditioning duct systems. Sheet metal is also used for restaurant equipment, outdoor signs, rain gutters, customized precision equipment, railroad cars, tailgates, downspouts and so much more. Most all sheet metal workers specialize in making, installing and maintaining products.
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It starts with studying specifications and plans to determine what needs to be fabricated and the quantity of necessary materials. After establishing what is needed, the worker will measure, cut, and shape the pieces of sheet metal to make countertops, duct work and many other custom products. The cutting, drilling and forming of parts can be done with computer controlled lasers, presses, saws and shears. In instances where there is no use of computerized metalworking, workers make the calculations required and use rulers, tapes and other devices used for measuring to determine layout. Machines tools are then used to cut or stamp the parts.
Shears are one of the main cutting tools that are used in the industry. A few types of shearing operations include blanking, piercing, trimming and roll sitting. Though plates and sheet metal are most often sheared, rods can be sheared as well. To cut metals while shearing, hold-downs keep the metals in place. There are a few cutting angles that are possible with an angle gauge but this machine generally produces 90 degree cuts. These cuts are positioned by a squaring arm with a back gauge or a scale on it.
A moving blade pushes the workpiece against a fixed blade. The process of shearing can then produce a shear edge burr that can be minimized to less than 10% of the material thickness depending on the material. The separation between the two blades is defined as clearance. This is measured perpendicular to the direction of blade movement and at point where the cutting takes place. This affects both the machine power consumption and the finish of the cut. The blade gap is adjustable for different metal thickness on some sheet metal shears. The possibility of hold down marks and little burrs should be considered when forming most end products. Machine capacities for mild steel can be 50% for stainless steel and 33% higher for many types of soft aluminum.
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