(1) Frame. The U frame of micrometer is made of either steel or cast iron
(2) Hardened anvil. It protrudes from the frame for a distance of at least 3 mm for holding and
supporting the jobs for measurement.
(3) Screwed spindle. It does the actual measuring and possesses threads of 0.5 mm pitch.
(4) Barrel or Sleeve. It has datum line and fixed graduations.
(5) Thimble. This is a tubular cover fastened with the spindle and moves with the spindle. The
beveled edge of the thimble is divided into 50 equal parts, every fifth being numbered.
(6) Ratchet. This part is commonly recognized as friction stop of the micrometer, which acts as
a precautionary measure also. It is a small extension to the thimble in which the ratchet slips
when the pressure on the screw exceeds a certain amount.
This produces uniform reading and prevents any damage or distortion of the instrument.
(7) Spindle clamp. It is used to lock the instrument at any desired setting or at any particular
reading.
Kavungya answered the question on March 6, 2019 at 13:51
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