Topic: Metrology and Inspection
What is the least count of a micrometre with a pitch of 0.5 mm and a thimble having 50 divisions?
- A. 0.01 mm
- B. 0.005 mm
- C. 0.02 mm
- D. 0.001 mm
Answer: A. 0.01 mm
Explanation: The least count (LC) of a micrometer is calculated by dividing the pitch of the screw by the total number of divisions on the circular scale (thimble).
$LC = \frac{Pitch}{Divisions} = \frac{0.5~mm}{50} = 0.01~mm$.