Vernier calipers and micrometers are both commonly used precision measuring tools, but what are the differences
between them? Today we will talk in detail about the characteristics of these two measuring tools, as well as their
respective application scenarios, to help you better choose and use.
I. Principle of measurement of vernier calipers and micrometers
1. Vernier caliper: Vernier caliper use the main ruler and the vernier to improve the accuracy of the reading.
The scale on the main ruler is usually millimetres, and the scale on the vernier is slightly different,
through the cooperation of the two can read out the size of the decimal digits.
2. Micrometer: Micrometer then use the principle of threaded vice for measurement. Rotate the micrometer screw,
the screw will drive the anvil to move, by reading the scale on the screw to determine the size of the measured object.
This is like a precision screw that can move forward or backward a very small distance with one rotation.
II. Measuring range and accuracy of vernier calipers and micrometers
1. Vernier caliper: Vernier caliper measurement range is usually larger, common specifications are 0-150mm, 0-200mm,
0-300mm and so on. Accuracy is generally 0.02mm, some high-precision vernier calipers can reach 0.01mm.
you can choose different specifications of vernier calipers according to need.
2. Micrometer: The measuring range of micrometer is relatively small, usually 0-25mm, 25-50mm, etc.
The measuring range of each micrometer is fixed. But the micrometer is more accurate, usually 0.01mm,
some high-precision micrometer can reach 0.001mm. therefore, the micrometer is more suitable for measuring
small size and high-precision parts.
III. Vernier calipers and micrometers applicable scenarios
1. Vernier calipers: Vernier calipers are suitable for measuring outer diameter, inner diameter, depth and step height.
Because of its large measuring range, it is widely used in machining, automotive repair and other fields.
For example, we can use vernier calipers to measure the diameter of a shaft, or measure the depth of a hole.
2. Micrometer: Micrometer is more suitable for measuring the size of precision parts, such as the diameter of the thread,
the thickness of the thin plate. Because of its higher accuracy, it is widely used in precision instrument manufacturing,
mould processing and other fields. For example, we can use the micrometer to measure the inner diameter of a nut,
or measure the thickness of a sheet of paper.
IV. Vernier calipers and micrometers use precautions
1. Clean: Before use to clean the measuring surface and the workpiece to be measured,
to ensure that no dust and debris affect the measurement accuracy.
2. Strength: the use of vernier calipers to measure, to maintain the appropriate measurement of strength,
to avoid too much force or too small resulting in measurement errors. When using micrometer measurement,
use the ratchet device to avoid excessive force to damage the measured workpiece or micrometer.
3. Zero calibration: regular zero calibration of vernier calipers and micrometers to ensure
the accuracy of the measurement results.
V. Vernier calipers and micrometers maintenance
1. Storage: use the vernier calipers and micrometers should be wiped clean, stored in a dry
and ventilated place to avoid moisture and corrosion.
2. Avoid collision: avoid vernier calipers and micrometers and hard objects collision,
to prevent damage to the measuring surface and scale.
3. Regular maintenance: regular maintenance of vernier calipers and micrometers,
such as lubrication of moving parts, you can extend its service life.
