least count

Question

A screw gauge has 50 divisions on its circular scale and moves forward by 0.5 mm when the circular scale completes one rotation. What is the least count of the screw gauge?

RankGuru · Accepted Answer

1. **Pitch Definition**: The distance moved by the screw per complete rotation of the head.
   - Given Pitch $= 0.5$ mm.
2. **Least Count Formula**: $LC = \frac{	ext{Pitch}}{	ext{Total divisions on circular scale}}$.
3. **Calculation**:
   - $LC = 0.5 / 50$.
4. **Result**: $LC = 0.01$ mm.
5. **Note**: The least count determines the precision of the instrument.

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