Intro to Millwright 2025 – 400 Free Practice Questions to Pass the Exam

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What part of an outside micrometer is marked with a linear scale to aid in measurement?

Spindle

Anvil

Sleeve

The sleeve of an outside micrometer is marked with a linear scale that assists in taking accurate measurements. This scale is typically graduated in millimeter or inch increments, allowing the user to read the primary measurement directly as the micrometer is closed around the object being measured. The sleeve work in conjunction with the thimble scale, which is also used to provide a finer measurement by indicating partial increments beyond the full readings on the sleeve.

The sleeve's linear scale is crucial for determining the overall dimensions of an object, as it provides an easy reference point for the initial reading. When you rotate the thimble, the spindle moves closer to the anvil, allowing for more precision as you make the necessary adjustments based on the sleeve's measurements.

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Thimble

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