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PRECISE MEASUREMENTS

EXPERIMENT # 1. PRECISE MEASUREMENTS. Micrometer Vernier caliper. Objectives: To determine the diameter of a metal ball and the length of the cube using VERNIER CALIPER. To measure the diameter of the wire using MICROMETER. VERNIER CALIPER. PARTS OF A VERNIER CALIPER

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PRECISE MEASUREMENTS

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  1. EXPERIMENT # 1 PRECISE MEASUREMENTS Micrometer Vernier caliper

  2. Objectives: • To determine the diameter of a metal ball and the length of the cube using VERNIER CALIPER. • To measure the diameter of the wire using MICROMETER.

  3. VERNIER CALIPER

  4. PARTS OF A VERNIER CALIPER 1 - Outside jaws: used to take external measures of objects 2 - Inside jaws: used to take internal measures of objects 3 - Depth probe: used to measure the depth of objects 4 - Main scale (cm & inch) 5 - Vernier Scale 6 - Retainer: used to block movable part

  5. Measuring Using the Vernier: • Keep the body to be measured between the fixed jaw and mobile jaw Without pressure on it. • Take the main scale reading. • The division of the vernier that coincides with any division on the main scale is • also noted. This is the vernier scale reading. • Then, the measurement of the object will be = Main scale reading + (vernier scale reading x least count) Here, Least count = Value of One Main Scale Division / Total Number of Divisions on the Vernier Scale The units of measurement is in millimeters (mm).

  6. For vernier caliper: Total reading = MSR + (VSR x LC) MSR = Main Scale Reading VSR = Vernier Scale Reading LC = Least Count MSR = 2.7cm x 10 = 27mm VSR = 1(5) = 5 x 0.02 mm = 0.1mm Total Reading = 27.1 mm

  7. Electronic vernier calipers are also available The procedure for taking measurements remains the same.

  8. MSR = .9 cm x 10 = 9 mm VSR =3.6(5) = 18 x 0.02 mm = .36 mm Total Reading = 9.36 mm

  9. MSR = ______________________________ VSR = ______________________________ Total Reading = _______________________

  10. SCREW GAUGE/ MICRO METER Micrometer: Is a tool designed to measure the thickness of an object

  11.  MEASURING USING THE MICROMETER: • 1. Keep the object between the measuring jaws. • 2. Bring the measuring jaws together by turning • the screw until the object is clamped and the • thickness to be read no longer changes. • 3. Take the main reading and the head scale • reading.

  12. For micrometer: Total reading = MSR + (HSR x LC) MSR = Main Scale Reading HSR = Head Scale Reading LC = Least Count QUESTION 1 MSR = 7 mm HSR = 0 x 0.01 mm = 0 mm Total Reading = 7 mm

  13. QUESTION 2 MSR = 8 mm HSR = 12 x 0.01 mm = 0.12 mm Total Reading = 8.12 mm

  14. QUESTION 3 MSR = __________________________ HSR = __________________________ Total Reading = ___________________

  15. Electronic screw gauge is also available. The procedure for taking the measurements remains the same

  16. Conclusion: The diameter of the metal ball is _____________ The length of the cube is ____________. The diameter of the wire is ____________.

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