Practical No. 02: Measurements of dimensions of given objects by micrometer screw gauge.
XIV. Conclusions and Recommendations
- It is concluded that consistent and accurate readings can be achieved by using the ratchet to avoid over-tightening.
- It is highly recommended to always determine and apply the zero error correction for every measurement session.
XV. Practical Related Questions & Answers
Q1. Are micrometers used in telescopes or microscopes?
- Answer: The measuring tool called a micrometer is not typically a direct part of a telescope or microscope. However, the precision screw mechanism, which is the core principle behind the micrometer, is widely used in these instruments for precise focusing.
Q2. State the main types of screw gauges.
- Answer: The main types are:
- Outside Micrometer: For measuring external dimensions.
- Inside Micrometer: For measuring internal dimensions.
- Depth Micrometer: For measuring depths of holes and slots.
Q3. State the range of given micrometer screw gauge used in experiment.
- Answer: The range of the given micrometer screw gauge is 0 to 2.5 cm.
Q4 & 5. The circular scale of a screw gauge contains 100 divisions and its pitch is 1 mm. Give the least count of the screw gauge.
- Answer:
- Formula:
Least Count (L.C.) = Pitch / Number of circular divisions - Given Data:
- Pitch = 1 mm
- Number of circular divisions (n) = 100
- Calculation:
- L.C. = 1 mm / 100
- L.C. = 0.01 mm
- Formula:
Q6. In ten rotations of the screw, distance travelled on main scale is 20 mm. If number of divisions on circular scale are 50. Find L.C. of micrometer screw gauge.
- Answer:
- Step 1: Find the Pitch
- Pitch = Distance moved / Number of rotations
- Pitch = 20 mm / 10 = 2 mm
- Step 2: Find the Least Count (L.C.)
- L.C. = Pitch / Number of circular divisions (n)
- L.C. = 2 mm / 50
- L.C. = 0.04 mm
- Step 1: Find the Pitch
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