What should you pay attention to when using a spiral micrometer?

When using a spiral micrometer, please note: 1. Stop using the knob when the micrometer screw is close to the object to be measured; 2. Pay attention to whether the half-millimetre mark has been exposed; 3. There is a thousandth mark. The position estimation reading number cannot be thrown away casually; 4. Remove the value with zero error from the post-measurement length reading.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

When using a spiral micrometer, you should pay attention to the following points:

1. When measuring, when the micrometer screw is close to the object being measured, you should stop using the knob and use the fine-tuning knob instead to avoid Producing excessive pressure can not only make the measurement results accurate, but also protect the spiral micrometer.

2. When reading, pay attention to whether the half-millimetre mark on the fixed scale has been exposed.

3. When reading, there is an estimated reading number at the thousandths position, which cannot be thrown away casually. Even if the zero point of the fixed scale is exactly aligned with a certain scale line of the movable scale, the thousandths position should still be read. is "0".

4. When the small anvil and the micrometer screw are close together, the zero point of the movable scale does not coincide with the zero point of the fixed scale, and there will be a zero error, which should be corrected, that is, on the final reading of the length. Remove values ​​with zero error.

Extended information:

The spiral micrometer is also called a micrometer, spiral micrometer, and centicalibur. It is a more precise length measurement than a vernier caliper. Tool, with which the length can be measured accurately to 0.01mm, and the measuring range is several centimeters. Part of it is processed into a thread with a pitch of 0.5mm. When it rotates in the threaded sleeve of the fixed sleeve B, it will move forward or backward. The movable sleeve C and the screw are connected into one body, and its periphery is divided into 50 equal divisions. The number of complete turns of the screw is measured by the engraved lines spaced 0.5mm apart on the fixed sleeve. The part that is less than one turn is measured by the engraved lines around the movable sleeve. The final measurement result needs to be estimated to one decimal place.

Spiral micrometers are divided into two categories: mechanical micrometers and electronic micrometers.

An electronic micrometer (spiral micrometer)

①Mechanical micrometer. For example, the standard outer diameter micrometer, referred to as a micrometer, is a hand-held universal length measurement tool that uses the precision thread pair principle to measure length. In 1848, J.L. Palmer of France obtained a patent for the outer diameter micrometer. In 1869, J.R. Brown and L. Sharp of the United States made the outer diameter micrometer into a commercial product, which was used to measure the outer diameter of metal wires and the thickness of plates. There are many varieties of micrometers. By changing the shape of the micrometer measuring surface and the scale frame, micrometers for different purposes can be made, such as micrometers used to measure the inner diameter, thread pitch diameter, gear normal or depth, etc.

②Electronic micrometer such as digital display outer diameter micrometer. Also called a digital micrometer, grating length measurement technology and integrated circuits are used in the measurement system. Electronic micrometers appeared in the mid-1970s and are used for outer diameter measurement.

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