Is the pitch of the main scale in screw gauge also equal to the least count of the main scale of screw gauge ?What does it mean when we say that the zero of the main scale is barely visible in screw gauge ?

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Consider a Vernier calipers in which each $1 c m$ on the main scale is divided into $8$ equal divisions and a screw gauge with $100$ divisions on its circular scale. In the Vernier callipers, $5$ divisions of the Vernier scale coincide with $4$ divisions on the main scale and in the screw gauge, one complete rotation of the circular scale moves it by two divisions on the linear scale. Then

Q. In a screw gauge, the main scale division is

1 mm

and there are

100

divisions on circular scale. The least count of screw gauge is (Pitch

= 1 mm

)

Q. A screw gauge with a pitch of

0.5 m m

and a circular scale with

50

divisions is used to measured the thickness of a thin sheet of Aluminium. Before staring the measurement, It is found that when the two jaws of the screw gauge are brought in contact, the

45^{t h}

division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness of the sheet if the main scale reading is

0.5 m m

and the

25^{t h}

division coincides with the main scale line?

A screw gauge with a pitch of 0.5 mm and a circular scale with 50 divisions is used to measure the thickness of a thin sheet of Aluminium. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact, the $45^{t h}$ division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness of the sheet is the main scale reading is 0.5 mm and the $25^{t h}$ division coincides with the main scale line?

Q. A screw gauge with a pitch of 0.5mm and a circular scale with 50 divisions is used to measure the thickness of a thin sheet of aluminium. Before starting the measurement it is found that when the two jaws of the screw gauge are brought in contact the 45th division concides with the main scale line and that the zero of the main scale is barely visible. what is the thickness of the sheet if the main scale reading is 0.5mm and the 25th division coincides with the main scale line?

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