A micrometer is used to make precise measurements to the thousandth of an inch.
The Micrometer sleeve is divided into forty equal parts. Each part or division is indicated by a vertical line. Each vertical line represents one-fortieth of an inch or .025″, and, each fourth line is marked by a longer line and a number which designates one hundred-thousandths.
More simply, the line marked “1” represents .100″, the line marked “2” represents .200″ and so forth.
The thimble is divided into twenty-five equal parts, and, one complete rotation of the thimble coincides with the smallest division on the sleeve. Thus, the division on the thimble is one-twenty-fifth of .025″ or .001″.
Reading Example:
(1) Reading on the Sleeve — .200″
(2) No. of lines between “2” and the edge of the thimble — .025″
(3) Thimble line corresponding to the centerline of the sleeve — .001″
TOTAL READING — .226″
This video describes how to read a micrometer that is calibrated to read to the nearest thousandth of an inch.
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