How to use caliper, micrometer and micrometer respectively?

Rules for the use of calipers: When measuring, hold the ruler with the right hand, move the cursor with the thumb, and hold the object with the measured outer diameter (or inner diameter) with the left hand, so that the measured object is located between the outer measuring claws. When it is tightly attached to the measuring claw, the reading can be read.

Reading rules of calipers:

1. When reading, first read the millimeter integer on the scale according to the zero scale line of the cursor, that is, the integer part in millimeters. Then see which tick marks on the cursor are aligned with the tick marks on the ruler body.

2. If the sixth scale line is aligned with the scale line, the decimal part is 0.6 mm. ..

The dial indicator is a misnomer, but it is actually a micrometer.

Rules for the use of micrometer: first check the zero point, and then hold the ruler frame with your left hand. Turn the coarse adjustment knob D with your right hand to make the distance between the measuring rod E and the measuring anvil A slightly larger than the measured object, put the measured object in, turn the protection knob D' until the ratchet makes a sound, and turn the fixed knob B to fix the measuring rod and read.

Reading rule of micrometer: read the fixed scale first, and then read half a foot. If the half scale line has been exposed, record it as 0.5 mm, otherwise record it as 0.0 mm. Re-read the movable scale mark n * 0.0 1 mm, and the final accurate reading is fixed scale+half scale+movable scale+estimated reading.

Extended data:

The screw micrometer is made according to the principle of screw amplification, that is, when the screw rotates in the nut once, the screw moves forward or backward by one pitch along the rotating shaft.

So, the tiny distance along the axis can be expressed by the reading on the circumference? . The pitch of the precision thread of the screw micrometer is 0.5 mm, and the movable scale has 50 equal divisions. When the movable scale rotates once, the micrometer screw can move forward or backward by 0.5 mm. ..

Therefore, when the micrometer screw moves forward or backward, rotating each small division is equivalent to 0.5/50 = 0.01mm. It can be seen that each cell of the movable scale represents 0.0 1 mm, so the screw micrometer can be accurate to 0.0 1mm, so it is called micrometer because it can read another cell and can read one thousandth of a millimeter.

Baidu encyclopedia-spiral micrometer

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Baidu encyclopedia-caliper