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Tool time Tuesday and today we’re grinding, on an angle. My oldest son, Mason, was fabricating a spare tire mount for his truck over the weekend and one of the tools he was using was an angle grinder. The angle grinder was invented in 1954 by a German company called Ackermann-Schmitt. The angle grinder can be powered by electricity, compressed air or even battery. It was originally developed as a grinder using abrasive discs, but soon other types of discs were developed to widen the possible uses of the tool. Today you can get discs for cutting, polishing, grinding, sanding and cleaning. With so many attachments, the angle grinder is a must have in any shop, especially those that work with metal.