What is the function of a micrometer?

What is the function of a micrometer?

• A. To measure long distances
• B. To measure temperature
• C. To measure small dimensions with high accuracy, typically to 0.001 in or 0.01 mm
• D. To cut metal

Answer: (C)

Micrometers are used to measure small dimensions with high accuracy. They’re built to give readings much finer than a ruler or caliper, typically down to 0.001 inch or 0.01 mm. The tool works with a fixed anvil and a movable spindle; you advance the spindle by turning the thimble. To read it, you note the value on the sleeve (the main scale) and then add the value on the thimble (the circular scale). The smallest reliable increment—the least count—is 0.001 inch or 0.01 mm, depending on whether you have imperial or metric units. Before measuring, you zero the instrument to ensure accurate results, and the ratchet mechanism helps apply consistent pressure so readings aren’t affected by how hard you push. In practice, you’d use this to check features like a shaft diameter, bolt shank, or a bearing bore where precise size matters. It isn’t used for measuring long distances, it doesn’t measure temperature, and it isn’t a cutting tool.

Micrometers are used to measure small dimensions with high accuracy. They’re built to give readings much finer than a ruler or caliper, typically down to 0.001 inch or 0.01 mm. The tool works with a fixed anvil and a movable spindle; you advance the spindle by turning the thimble. To read it, you note the value on the sleeve (the main scale) and then add the value on the thimble (the circular scale). The smallest reliable increment—the least count—is 0.001 inch or 0.01 mm, depending on whether you have imperial or metric units. Before measuring, you zero the instrument to ensure accurate results, and the ratchet mechanism helps apply consistent pressure so readings aren’t affected by how hard you push.

In practice, you’d use this to check features like a shaft diameter, bolt shank, or a bearing bore where precise size matters. It isn’t used for measuring long distances, it doesn’t measure temperature, and it isn’t a cutting tool.