Vernier calipers are commonly used in precision measuring tools and are widely used in machining, quality
control and other fields. Today, we're going to dive into the accuracy of vernier calipers and how to effectively
control measurement errors.
Ⅰ、Vernier caliper accuracy specifications
Vernier calipers typically have the following specifications for accuracy:
1. 0.02mm: This is the most common accuracy class and is suitable for most common precision
measurement applications.
2. 0.01mm: High-precision version for more precise measurement needs.
3. 0.05mm: The accuracy is relatively low, and it is mainly used for rough measurements or occasions
where accuracy is not required.
It's important to note that accuracy does not equate to graduation. For example, a caliper with a 0.02mm
accuracy may have a scale resolution of 0.01mm, but its actual measurement accuracy is ±0.02mm.
Ⅱ、Factors that affect the accuracy of vernier calipers
To realize the full accuracy potential of a vernier caliper, we need to understand the main factors
that affect its accuracy:
1. Manufacturing quality: High-quality vernier calipers will be manufactured with more precise processing
technology and stricter quality control.
2. Material selection: High-quality stainless steel materials can reduce the effects of temperature changes
and improve measurement stability.
3. Environment: Environmental factors such as temperature and humidity will affect the measurement results,
and the ideal measurement environment temperature should be 20°C.
4. Operate tips: Incorrect handling methods can lead to increased measurement errors,
such as excessive measuring forces.
Ⅲ、The source of error in vernier calipers
Knowing the source of the error helps us to better control the accuracy of our measurements:
1. Scale error: The scale accuracy of the master ruler and vernier directly affects the measurement results.
2. Parallelism error: The non-parallel measuring jaws will cause the measured value to be too large.
3. Wear error: The wear of the measuring jaw caused by long-term use will affect the measurement accuracy.
4. Temperature error: Metallic materials can expand or contract with temperature changes, affecting
the measurement results.
Ⅳ、Tips to improve the accuracy of your measurements
Here are some practical tips to help you get the most out of your vernier caliper's precision potential:
1. Correct measurement posture: Keep the caliper perpendicular to the object to be measured
and avoid oblique measurement.
2. Appropriate measuring force: Use the appropriate force to ensure good contact without over-squeezing
the deformed object.
3. Acclimatization: Let the calipers sit in the measurement environment for a period of time before use to keep
their temperature consistent with the environment.
4. Multi-point measurement: Multiple measurements of the same size, averaging can reduce random errors.
5. Regular calibration: Calipers are professionally calibrated at specified intervals to ensure that they remain
within the specified accuracy range.
