Question

Mention the formula for least count of a screw gauge?
How can we correct the screw gauge itself for the zero error?

Answer 1

Answer:

L.C= L.C= =0.01 mm

If the head scale zero is just above the index line of the pitch scale then the screw gauge has negative error and correction is positive head scale zero is just below the index line of the pitch scale , then the screw gauge has positive error and zero correction is negative .The correction must applied to the observed

Answer 2

Answer 1

since, list count of a screw gauge is the distance moved by the screw when it is rotated by on circular scale division.

therefore

Formula

least count = pitch/ number of division on circular scale

Answer 2

To correct the screw gorge itself for zero error ,the fixed is adjusted by screwing it, in or out.