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What is the use of ratchet stop in micrometer?

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What is the use of ratchet stop in micrometer?

(a) Prevent motion of spindle

(b) Maintain uniform measuring pressure

(c) Provide measuring surface

(d) Forms measuring tip

I had been asked this question in an interview for job.

My query is from Micrometers topic in section Linear Measurements of Engineering Metrology

1 Answer

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Correct answer is (b) Maintain uniform measuring pressure

Easiest explanation: Ratchet stop is present at the end of thimble cap to maintain a uniform measuring pressure. By ratchet stop standard conditions of measurement are attained.

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