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For cutting thin aluminum sheet and bar stock, use a plasma cutter for a clean edge and minimized warping. The result is a narrow cut and is much faster than metal snips, which can sometimes distort the metal.Perfectly straight cuts can be obtained with this simple tip: Clamp a thin piece of straight bar stock onto the sheet metal. The bar stock will serve as a guide for the torch yielding in a straight cut. Here, Ron cuts the strips that are used as the base of the frame using a Spectrum(r) 625.