Discussion
Locknut in the micrometer is provided for which function?
Answer: B
The locknut is provided to lock the reading after setting it over the workpiece.
Once the spindle has been closed on the work, the locknut (spindle lock) is tightened so that the spindle cannot turn. The micrometer can then be withdrawn and read without the setting changing, and it can be used as a fixed gauge for checking several parts.
The thimble and ratchet, not the locknut, control the movement of the spindle and give a consistent measuring pressure. Accuracy comes from the screw and the scales. Locking the spindle when the instrument is put away is not its purpose; micrometers are in fact stored with the faces apart and unlocked.
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