With Vernier Callipers, one is able to measure the length accurately up to 0.1 mm. More accurate measurements up to 0.01 mm or 0.005 mm, may be done using a screw gauge. A Screw gauge is an instrument with higher precision than the vernier calliper. Here, in the experiment, we will be discussing how to measure the thickness of a given sheet using a screw gauge.
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Aim
To measure the thickness of the sheet using a screw gauge.
Apparatus/ Materials Required
- Screw Gauge
- Sheet
- Magnifying Lens
Theory
Read More: Screw Gauge
Formula
- \(\begin{array}{l}Pitch\, of\, the\, Screw=\frac{Distance\,moved\,by\,the\,screw}{No\,of\,full\,rotations\,given}\end{array} \)
- \(\begin{array}{l}Least\,Count=\frac{Pitch}{Total\,Number\,of\,Divisions\,on\,the\,Circular\,Scale}\end{array} \)
Procedure
- Again, insert the sheet between the studs of the screw gauge and determine the thickness at five different positions.
- Find the average thickness and determine the correct thickness by applying the zero error.
Observations
The least count of the screw gauge = ….. mm
Zero Error of screw gauge = ….. mm
| S.No | Linear Scale Reading M (mm) | Circular Scale Reading n | Thickness
t = M + n × L.C (mm) |
| 1
2 3 4 5 |
Mean thickness of the given sheet = ….. mm.
Mean corrected thickness of the given sheet = Observed thickness – Zero error = …… mm.
Result
The thickness of the given sheet is …..mm.
Viva Voce
- What is meant by the pitch of a screw?
Answer:
The distance between the two nearest threads along the axis of the screw is known as the pitch of the screw. - What is the least count of the screw gauge?
Answer:
The least count of the screw gauge is 0.001 cm. - What is meant by the zero error of a screw gauge?
Answer:
The error that arises when the zero of the circular scale does not coincide with the zero of the main scale upon joining the two studs. - When is the zero error positive?
Answer:
If the zero of the circular scale lies above the reference line, provided that the fixed and movable studs are in contact. - What is meant by the range of the screw gauge?
Answer:
The maximum length of the main scale is known as the range of the screw gauge. - Does the diameter of the screw depend on the temperature?
Answer:
Yes, the diameter of the screw depends on the temperature. When the temperature increases the diameter of the screw increases.
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