Explain the term :
1. Pitch
2. Least count of a screw gauge.
How they are determined?
(I) Pitch of screw gauge
it is the distance moved by the screw through its axis along one complete rotation.
(ii) Least count of a screw gauge -
It is the distance moved by it in rotating the circular scale by one division.
Pitch & L.C. of the screw gauge can be determined by:
L.C = Pitch of the screw gauge ÷
total number of divisions on its circular scale
For example, it a screw moved by
1 mm through 1 rotation and id the circular scale has
100 divisions, then the pitch of the screw = 1 mm.
The L.C = 1 mm/100 = 0.01 mm = 0.001 cm
Regards