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A bandsaw is a power tool which uses a blade consisting of a continuous band of metal with teeth along one edge to cut various workpieces. The band usually rides on two wheels rotating in the same plane, although some bandsaws may have three or four wheels. Bandsawing produces uniform cutting action as a result of an evenly distributed tooth load.〔.〕 Bandsaws are used for woodworking, metalworking, or for cutting a variety of other materials. They are particularly useful for cutting irregular or curved shapes, but can make straight cuts. The minimum radius of a curve that can be cut on a particular saw is determined by the width of the band and its kerf. ==History== The idea of the band saw dates back to at least 1809, when William Newberry received a British patent for the idea, but band saws remained impractical largely because of the blades. Constant flexing of the band saw blade over the band saw wheels caused the material or the welded joint of the blade to fail. Nearly 40 years passed before a French woman, Anne Paulin Crepin, devised a technique for welding a band saw blade so that it could withstand the rigors of sawing and bending around band saw wheels. She applied for a patent in 1846, and soon afterward, manufacturer A. Perin & Company of Paris, France, purchased the rights to her innovation. Combining Crepin’s welding method with new steel alloys and advanced tempering techniques, Perin created the first modern band saw blade. The first American band saw patent was granted to Benjamin Barker of Ellsworth, Maine, in January of 1836. According to the sources the first factory produced and commercially available band saw was the Paul Prybil's band saw patent for cutting wood. Power hacksaws (with reciprocating blades) were once common in the metalworking industries, but bandsaws and cold saws have mostly displaced them. oi same 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bandsaw」の詳細全文を読む スポンサード リンク
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