SURYALOOP

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Jenny calipers are used for marking and layout work .

TrySquare The Trysquare  is a Prescision  instrument Which is used to check squareness  (angle of 90 °) of a surface . The accuracy of measurement by a try square is about 0.002mm per 10mm 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 square is used to check the squareness of machined or filled surfaces . -Check the flatness of surfaces . - Mark lines at 90 ° to the edges of workpieces . (Trysquare made of hardened steel ) -try squares are specified according to the lengths of the blade ie.100mm ,150mm ,200mm .

    Steelrule When dimensions are given in a drawing without any indication about the tolerance , it has to be assumed that measurements are to be made with a steel rule .          Steel rules are made of spring steel or stainless steel . the edges are accurately ground to form straight edges . The surface of the steel rule is stain-  chrome  finished to reduce glare , and to prevent  rusting . Sizes of steel rules  Steel rules are available in different lengths, the common sizes being 150 mm , 300mm and 600mm. The engineer's steel rule is graduated in 10mm , 5mm ,1mm and 0.5 mm . The reading accuracy of the steel rule is 0.5mm .

Hand files - Hand file These files are similar to the flat files in their  cross section . The edges along the width are parallel throughout the length . The faces are double cut . One edge is single cut where as the other is safe edge . Because of the safe edge , they are useful for filing  surfaces which are at right angles to surfaces already finished .

Flat files - Flat file These files are of a rectangular cross section . The edges along the width of these files are parallel up to two - thirds of the length , and then they taper towads the point . The faces are double cut , and the edges single cut .these files are used for general purpose work . They are useful for filing and  finishing external and internal surfaces .

Dead smooth file side A dead smooth file is used to bring to accurate size with a high degree of finish .