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Use of Apparatus and Techniques

Calipers and micrometers for small distances

  • 3 things to know
  • Components 01, 02 and 03

Overview

Recall questions on the resolution of micrometers and vernier calipers, reading a vernier scale, the micrometer ratchet, finding and correcting a zero error, internal jaws and the depth probe, measuring a wire's diameter and cross-sectional area and the percentage uncertainty in the area, over-tightening on soft objects, and the limited range of a micrometer.

What you need to know

Answer each one before you reveal it.

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Key term

How is the zero error of a micrometer found?

Key term

A micrometer reads −0.03 mm when closed and 2.47 mm on a wire. State the corrected diameter.

Key term

What are the internal jaws and the depth probe of a pair of calipers used to measure?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the resolution of a micrometer screw gauge?

    Model answer

    It reads to 0.01 mm.

  2. 2

    What is the resolution of vernier calipers with a ten-division vernier scale?

    Model answer

    They read to 0.1 mm.

  3. 3

    How is a reading taken from a vernier scale?

    Model answer

    The main scale value just before the zero of the vernier is read, then the vernier division that lines up exactly with a main scale division gives the extra fraction to be added.

  4. 4

    On vernier calipers the zero of the vernier lies just past the 23 mm mark and the fourth vernier division coincides with a main scale mark. State the reading.

    Model answer

    The reading is 23.4 mm.

  5. 5

    What is the purpose of the ratchet on a micrometer?

    Model answer

    It slips once a set contact force is reached, so every measurement is made with the same gentle pressure and the object is neither compressed nor the frame strained.

  6. 6

    How is the zero error of a micrometer found?

    Model answer

    The jaws are closed gently on nothing using the ratchet and the reading is noted; any departure from zero is the zero error.

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