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Try square, , Objectives : At the end of this lesson you shall be able to, * name the parts of a try square, *_ state the uses of a try square., , The try square (Fig. 1) is a precision instrument which is, used to check squareness (angles of 90°) of a surface., , , , Fig 1, , , , STRAIGHT EDGE, , , , , , MoNs20181, , , , The accuracy of measurement by a try square is about, 0.002 mm per 10 mm length, which is accurate enough, for most workshop purposes. The try square has a blade, with parallel surfaces. The blade is fixed to the stock at, 90°., , Uses, The try squareness is used (Figs 2 & 3), , , , Fig2, , , , owr20152, , , , , , * check flatness of surfaces (Fig. 3), , , , Fig3, , mons20rss, , , , * mark lines at 90° to the edges of workpieces (Fig., , 2, , , , Fig 4, , ovra0rsa, , , , * set workpieces at right angles on work. holding devices., (Fig. 5), , , , , , onr2ores, , , , , , , , Try squares are made of hardened steel., , Try squares are specified according to the lengths of the, blade, i.e 100 mm, 150 mm, 200 mm., , Use of a try square and steel rule.