What is the function of ratchet in screw-gauge?
ICSE Class 9 Physics Chapter Measurements and Experimentation
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The function of ratchet in screw-gauge is to advance the screw by turning it till the object is gently held between the stud and spindle of the screw.
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The ratchet in the micrometer (screw gauge) is a small mechanism inside the screw nut drum, with the purpose of limiting the measuring force of the spindle screw. It works by a calibrated small drum that limits the friction force applied to the measure work piece and produces a ratchet sound when the thimble is locked.
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