Q7. Look at the figure of screw gauge, let a small steel ball is place between its thimble and anvil then:

Look at the figure of the screw gauge, let a small steel ball is place between its thimble and anvil then:

 

 

 

 

a. What is its main scale reading?
b. What is the coinciding division of circular scale?
c. Calculate the total diameter of the ball.

Ans:

a. The main scale reading (reading which is visible) is 6.5 mm.
b. The coinciding division on circular scale is 46th division.
c. The total reading:
6.5+46(0.01) mm = 6.5 + 0.46 cm = 6.96 mm

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