Which part of the micrometer should be cleaned to remove debris after use?
Measuring faces
A micrometer measures by closing its spindle against a fixed anvil; the workpiece is gripped between these two contact surfaces, called the measuring faces.
Any dirt, oil, or metal debris on the measuring faces sits between the tool and the work, so the reading is taken over the debris and becomes inaccurate.
The measuring faces also make metal-to-metal contact and can be scored or corroded if grit is left on them, so they are wiped clean after every use.
The lock nut, ratchet stop, and thimble do not contact the workpiece, so cleaning them does not affect the measured dimension.
Hence, the answer is Measuring faces.
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Important Questions from Measuring Tools
Which of the following is NOT a type of comparator?
Which gauge is most suitable to measure cylindrical ring gauge?
Which of the following is used to check the gap between contact breaker points?
Which of the following is used to measure the ovality of a cylinder bore?
The least count of a Vernier height gauge in the metric system is ______.
