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COMMENTS:- This experiment very helpful for identification of apparatus available in the lab. Lab Staff tells about the apparatus available in the lab. We have also taken the measurements and dimension of the lab to draw the layout of the lab according their exact location . 25
MECHANICS OF SOLIDS-I 2019 EXPERIMENT NO. 02 “STUDY OF SMALL INSTRUMENTS” Objective : To get familiar with small instruments used in several experiments To measure the diameter, linear dimensions etcetera of small objects 1.VERNIER CALIPER Purpose: It is used to measure internal diameter, external diameter, and length of small objects, depth and thickness of small objects. VERNIER CALIPER Parts: Main scale Venire scale Upper jaws Lower jaws Depth measuring stem Screw clamp 26
MECHANICS OF SOLIDS-I 2019 Its upper jaws are used for measuring the internal diameter and Lower jaws are used for measuring the external diameter and length of objects. Depth measuring stem is for measuring the depth of liquid container. Least count : The smallest measurement, that any instrument can measure, is called least count. Least count of main scale = 1mm Least count of Vernier scale = 0.05mm Zero Error: If zero of main scale is to the left of Vernier scale’s zero, subtract the error in the end from final reading & vice versa. Mathematically: Length = Main Scale Reading + (Least Count * Vernier Scale Reading) 2. MICROMETER SCREW GAUGE Purpose: It is use to find external diameter, length up to 25.4mm (1 inch). And thickness 27
MECHANICS OF SOLIDS-I 2019 To measure the dimensions with greater accuracy Parts : Main scale (horizontal scale) Minor scale (micrometer scale, circular scale) Frame and lock nut. Ratchet knob. Anvil and spindle Least Count: Least Count = Pitchof instrument Total No .of DivisionsOnCircular Scale ¿ 0.5 50 = 0.01mm Pitch: By the Complete rotation of the circular scale on main scale, the circular scale covers a distance of 0.5mm. This is called pitch. 28
MECHANICS OF SOLIDS-I 2019 3. DEFLECTION GAUGE Deflection: Any of the displacement from the neutral axis of the member is referred as deflection. Purpose: To measure deflection of any structural member like beam, column and slab etc. Parts: Smaller circular scale Larger circular scale DEFLECTION GAUGE Least Count: Inner dial is divided in 10 parts & outer dial is divided in 100 parts. 29
MECHANICS OF SOLIDS-I 2019 Least count of smaller scale = 1mm Least count of larger scale = 0.01mm E.g. Inner scale reading = 4 Outer scale reading = 74 Final reading = 4.74 m 30
MECHANICS OF SOLIDS-I 2019 4. EXTENSOMETER Purpose: It is used to measure the elongation in steel, produced during the tension test. It can measure the maximum value of 25 mm. EXTENSOMETER Least Count : Least count of extensometer = 0.001mm This is very old instrument. Now day fully electronic extensometers are used which automatically give readings in digital form.

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• Winter '17
• salman ahmed

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