 | This article has multiple issues. Please helpimprove it or discuss these issues on thetalk page.(Learn how and when to remove these messages) (Learn how and when to remove this message)
|
AT-square is a technicaldrawinginstrument used bydraftsmen primarily as a guide for drawing horizontal lines on adrafting table. The instrument is named after its resemblance to the letter T, with a long shaft called the "blade" and a short shaft called the "stock" or "head". T-squares are available in a range of sizes, with common lengths being 18 inches (460 mm), 24 inches (610 mm), 30 inches (760 mm), 36 inches (910 mm) and 42 inches (1,100 mm).[citation needed]
In addition to drawing horizontal lines, a T-square can be used with aset square to draw vertical or diagonal lines.[1] The T-square usually has atransparent edge made ofplastic which should be free of nicks and cracks in order to provide smooth, straight lines.
T-squares are also used in various industries, such as construction. For example, drywall T-squares are typically made of aluminum and have a 48-inch-long (120 cm) tongue, allowing them to be used for measuring and cutting drywall. In woodworking, higher-endtable saws often have T-squarefences attached to a rail on the front side of the table, providing improved accuracy and precision when cutting wood.
