metrology lab report 1.docx

UNIVERSITI KUALA LUMPUR MALAYSIAN INSTITUTE OF INDUSTRY TECHNOLOGY

METROLOGY (JQB20203) LAB REPORT 2 MEASUREMENT

NAME : WAN IZNIFAIZNUR BINTI WAN MOHD IZUAN ID NO. : 57211216105 COURSE : BQE SEMESTER : 2 LECTURER NAME : EN. MOHAMAD IKBAR ABDUL WAHAB

Objective -

Ability to perform scale reading of digital caliper, dial caliper, and micrometer. Able to understand of the theories and techniques into practical application

Equipment -

Digital caliper Dial caliper Micrometer (range 0 – 25mm & 25mm – 50mm)

Apparatus -

U-shape block Pyramid block Dome shape

Procedure 1) The caliper and micrometer shall be checked for signs of damage before measurement. Damaged caliper and micrometer should not be used. 2) The measuring surface of caliper and micrometer was cleaned with some Ethanol and paper 3) Before started the measurement, the slider was checked by moving the slider slowly while lightly clamp screw until appropriate sliding smoothness is obtained. 4) The zero reading was checked 5) Eight dimension needed to be measured for the shape given 6) The selected dimension was measured by using digital caliper 7) The same dimension was measured until get 5 reading 8) Step 6 and 7 was repeated by using dial caliper 9) Step 4 until 8 was repeated by using two micrometer 10) Attachment 1 was filled with the measurement reading taken

11) Calculated the average and standard deviation for the measurement reading Discussion a) The measurement readings are more consistence when use digital caliper and micrometer. The result of dial caliper reading measurement are not consistence and less accurate.

b) i. Micrometer can measure small length more accurately than vernier caliper ii. Vernier caliper can measure depth while micrometer cannot measure depth

c) i. Digital Caliper - the consistency of digital caliper reading is more accurate even the measurement reading taken for 5 times ii. Dial Caliper - the reading taken sometimes accurate but most the reading not too accurate

d) i. Calipers - Common error is parallax error. Its occur when an object is observed from and angle. To avoid parallax error the observer should position his eyes directly above the scale when taking the readings ii. Micrometer - Zero error occurs when the flat end of the screw touches the stud or anvil and the gauge read other than zero. The gauge need to be adjust to restore accuracy.

e) I will use digital caliper. It is because digital caliper is easy to use. The LCD will display presents whole readings directly. It also has high accuracy and can be zeroed at any point. Cylinder rod have depth to be measure, the digital caliper can measure depth consistency than dial caliper. While micrometer cannot be measure the depth.

Conclusion

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To get accurate result use correct techniques and correctly handle the equipment. If not handle the equipment correctly the measurement reading might be not consistence and less accurate. The reading must be taken parallel to eyes or otherwise the readings are not correct.

References -

http://vernierscaliper.com/precautionary-steps-while-taking-measurements-by-verniercaliper-85.html https://www.reference.com/home-garden/zero-error-micrometer-screw-gauge3fdd5ecfec16367d#