Describe the procedure to measure the diameter of
a wire with the help of a screw gauge.
Answers
Answer:
Explanation:Screw gauge has more precision than the vernier caliper. The separation between each thread is the same. By rotating the nut in clockwise or anticlockwise, the screw can be moved either forward or backward. Pitch of the screw gauge is defined as the distance covered by the screw when it makes one complete rotation between the consecutive threads. It is usually either 1 mm or 0.5 mm. Below is the experiment on how to measure the diameter of a given wire usiing screw gauge.
Aim
To measure diameter of a given wire using screw gauge.
Materials Required
Screw gauge
Wire
Half-meter scale
Magnifying glass
Theory
What is least count?
Least count is given as:
Leastcount=pitchno.ofdivisionsoncircularscale
If a screw gauge has a pitch of 1 mm and 100 divisions on the circular scale then the least count is given as:
Leastcount=1mm100=0.01mm
How to take the linear scale reading?
Linear scale reading is taken by noting the mark on the linear scale which is close to the edge of the circular scale.
How to take circular scale reading?
Circular scale reading is taken by noting the division on the circular scale that coincides with the main scale reading.