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# Vernier Caliper

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### Vernier Caliper

1. 1. Use of Vernier Caliper <ul><li>Vernier Caliper can be used to measure diameter, thickness very accurately. </li></ul>
2. 2. Different Parts of Vernier Caliper <ul><li>Inside jaws </li></ul>Outside jaws VernierScale Main Scale Depth Gauge
3. 3. Measuring Internal Diameter <ul><li>Use the inside jaws of the caliper as shown </li></ul>
4. 4. Measuring External Diameter <ul><li>Use the outside jaws of the caliper as shown </li></ul>
5. 5. Measuring Depth of a Hole <ul><li>Use the depth gauge of the caliper as shown </li></ul>
6. 6. Reading the Vernier Scale <ul><li>Read the “0” position of the vernier scale on the main scale to get a rough reading. </li></ul><ul><li>Rough reading = 18mm </li></ul><ul><li>Look along the vernier scale until one of the vernier division coincides with the main scale </li></ul><ul><li>Accurate reading = 18.46mm±0.01 mm </li></ul>
7. 7. Exercise <ul><li>What is the reading in the caliper shown? </li></ul><ul><li>Please click on one of the following answer. </li></ul>A. 3.51cm B. 3.57cm C. 3.62cm D. 3.642cm E. 3.67cm 3.5 0 5 10 3 4 overlap
8. 8. Solution Read the “0” position of the vernier scale on the main scale to get a rough reading. Rough reading = 3.6cm Look along the vernier scale until one of the vernier division coincides with the main scale Accurate reading = 3.67cm±0.005cm 0 5 10 3 4 overlap