How to use and read the micrometer
How to use and read the micrometer
A, the use of the micrometer
1, before the use should check the zero point, slowly turn the tuning knob, make the rod and anvil contact, by the end of ratchet sound when moving feet mould scribed line on the sleeve (activity) shall be and fixed on the sleeve line (horizontal) is, or with zero error
2, left hand turning coarse adjustment knob rod and the anvil spacing slightly greater than the measured object, analyte in a sample of analyte to clamp, turning to protect knob until the ratchet sound, make the rod fixed upon the fixed knob after reading.
Second, micrometer reading method
1, read the fixed scale.
2, read half scale, if half scale line has been exposed, as 0.5 mm; If half the dial is not showing, as 0.0 mm.
3, read movable scale (note that for reading. As n x 0.01 mm.
4, the final reading results scale in fixed scale + + movable scale + for reading.
Because of spiral micrometer reading results accurate to mm micrometer level for the unit, so the spiral micrometer, also called micrometer.
Three, use micrometer considerations
1, measurement, pay attention to in the micrometer screw quickly close to the measured object should stop using the knob, and switch to fine-tune knob, avoid to produce too much pressure, can make accurate measurement results, and can protect the spiral micrometer.
2, when reading, pay attention to the said half millimeter scribed line on the fixed scale is showing.
3, readings, micrometer have an estimated number, can’t literally throw away, even if the fixed scale zero coincided with movable scale of a certain scale line alignment, micrometer seat should be read as “0”.
4, when the small anvil and micrometer screw together, movable scale zero zero is not collocated with fixed scale, there will be a zero error, should be revised, that is to remove the zero error on the last measure the length of the readings.
