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Straightening Castings

Many methods are practised for restoring crooked castings to the proper shape, but the best, when practicable, is to make them red-hot in a heating-furnace, and employ such means after-wards as will hold them in shape until they are cold. Perhaps it will be necessary to bend a little in the opposite direction before they can be made to assume their true shape. In proportion as this effective means of heating can be approached by outside firing, so will the measure of success be. Especially is this the case with large, complicated castings. Crooks in castings are seldom abrupt; the line invariably forms a true curve. To bring this back again correctly it is absolutely necessary that the whole be heated; otherwise it will simply yield at the heated spot or spots, leaving two or more short bends in place of the original regular curve, or, what is still more likely, break the casting. See PEENING.