Question

The head of a crew gauge has 200 divisions. Its head advances by 1 mm for 2 complete rotations of its head. Find it's pitch and least count.​

Answer 1

Explanation:

Head of the screw gauge advances 1 mm for two complete rotations.

So, pitch of the screw gauge P=

2

1 mm

=0.5 mm

Number of divisions N=200

So, Least count L.C.=

N

P

=

200

0.5 mm

=0.0025 mm