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PRACTICE / Micrometer screw gauge

Read the pitch and circular scale

A micrometer advances 0.50 mm per full turn and has 50 circular divisions. Its main scale reads 3.00 mm and its circular scale reads 25 divisions. Zero error is zero.

Find the measured length.

Organize the givens & assumptions
  • pitch = 0.50 mm
  • divisions = 50
  • MS = 3.00 mm
  • circular reading = 25

Uniform screw pitch and circular divisions; no backlash; zero error is zero as stated.

  1. A3.025 mm3.025\ \mathrm{mm}
  2. B0.25 mm0.25\ \mathrm{mm}
  3. C3.25 mm3.25\ \mathrm{mm}
  4. D3.50 mm3.50\ \mathrm{mm}

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