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A T-square is a technical drawing instrument used by draftsmen primarily as a guide for drawing horizontal lines on a drafting table. It may also guide a set square to draw vertical or diagonal lines. Its name comes from its resemblance to the letter T. T-squares come in varying sizes, common lengths being , , , and . T-squares are also used to measure and cut drywall. Drywall T-squares are typically made of aluminium and have a long tongue. Higher-end table saws are often equipped with T-square fences. These table saw fences are attached to a rail only on the front side of the table unlike traditional fences which clamp to both the front and the rear of the table. A T-square has two components - the long shaft called the "blade" and the short shaft called the "stock" or also known as head. The T-square usually has a transparent edge made of plastic which should be free of nicks and cracks in order to provide smooth, straight lines. ==See also== *Technical drawing tools 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「T-square」の詳細全文を読む スポンサード リンク
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