One complete revolution of the micrometer thimble advances the spindle

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Prepare for the Machinist Apprentice Level One Test. Utilize flashcards and multiple choice questions, complete with hints and explanations, to ensure readiness for your exam!

Multiple Choice

One complete revolution of the micrometer thimble advances the spindle

Explanation:
In a micrometer, the spindle advances toward the anvil by the screw’s pitch with each full turn of the thimble. For the common imperial micrometer with 40 threads per inch, one complete revolution moves the spindle by 1/40 inch, which equals 0.025 inches. That’s why the correct value is 0.025 in per revolution. Other numbers would reflect different thread counts or are facets of reading the measurement (the scale on the sleeve and the thimble), not the per-turn advance.

In a micrometer, the spindle advances toward the anvil by the screw’s pitch with each full turn of the thimble. For the common imperial micrometer with 40 threads per inch, one complete revolution moves the spindle by 1/40 inch, which equals 0.025 inches. That’s why the correct value is 0.025 in per revolution.

Other numbers would reflect different thread counts or are facets of reading the measurement (the scale on the sleeve and the thimble), not the per-turn advance.

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