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It depends on the screw thread pitch (or "lead") in the heart of the micrometer. Typically, screw pitches in common hand-held micrometers are 40 per inch in an Imperial micrometer or 2 per millimetre in a Metric micrometer. Thus, one full turn of the thimble of an Imperial micrometer is 1/40th of an inch (25 thousandths of an inch or "25 thou") and similarly, one full turn of the thimble of a Metric micrometer is 1/2 a millimetre (500 micrometres).
In order to read a micrometer, you will use the numbers on the thimble and on the sleeve. The numbers on the sleeve are broken down into 4 parts. Think of them as dollars with whole numbers and quarters. The numbers on the thimble can be represented as pennies, or ones. If the sleeve is at 9 3/4 and the thimble is at 4, the reading would be .979.
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All you need to do is make contact. Tightening will give you a false reading and eventually damage the micrometer.
what is the function of micrometer
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The knurling gives the fingers a better, non-slip grip.
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Hi, heres how you calculate least count of a micrometer. Use the given formula: Least Count (L. C) = Pitch/no. of divisions on micrometer barrel(thimble) where, Pitch = distance travelled by thimble on linear scale in one rotation. Hi, heres how you calculate least count of a micrometer. Use the given formula: Least Count (L. C) = Pitch/no. of divisions on micrometer barrel(thimble) where, Pitch = distance travelled by thimble on linear sacle in one rotation.
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This micrometer has zero error.The zero marking on the thimble is below the datum line. So this micrometerhas a positive zero error.In this case we will take the reading on the thimble.Thimble reading = 0.03 mmSo the micrometer has a zero error of +0.03 mm.Whatever reading we take on this micrometer we would have to subtract +0.03 mmThe zero marking on the thimble is above the datum line. So this micrometerhas a negative zero error.In this case we will have to count the number of divisions on the thimble between the zero marking and the datum line.No. of divisions = 3Measurement of each division = 0.01mmSo the micrometer has a zero error of -0.03 mm.Whatever reading we take on this micrometer we would have to subtract -0.03 mm