What are the specifications of steel rulers? How to read steel ruler?

Ruler refers to a measuring tool with precise straight edges. The ruler is used for straightness measurement and flatness measurement by the light gap method, and can also be used with the gauge block to check the length dimension. As a very common measuring tool, the steel ruler is naturally very widely used. The ruler has precise straight edges, so it is widely used in the field of engineering measurement and mathematics to measure the length of objects or engineering drawings. Rulers are divided into iron, wood and plastic according to different materials. Next, let's take a closer look at the specifications of the steel ruler specifications!

 

　　 Steel ruler specifications

 

The steel ruler is the simplest length measuring tool, and its length has four specifications of 150, 300, 500 and 1000mm. The steel ruler is used to measure the length of the part, and its measurement result is not very accurate. This is because the ruler spacing of the steel ruler is 1mm, and the width of the ruler itself is 0.1-0.2mm, so the reading error during measurement is relatively large, and only the number of millimeters can be read, that is, its minimum reading value is 1mm Values ​​smaller than 1mm can only be estimated.

If you use a steel ruler to directly measure the diameter of the part (shaft diameter or aperture), the measurement accuracy is even worse. The reason is: in addition to the relatively large reading error of the steel ruler itself, the steel ruler cannot be placed at the correct position of the part diameter. Therefore, the measurement of the diameter of the parts can also be carried out using a steel ruler and internal and external calipers.

 

　 Steel ruler reading

 

The reading of the steel ruler is divided into two parts, one part is the measured value and the other part is the estimated value. Usually the first 10cm of the steel ruler has an accurate value of 0.5mm, and the one after 10cm is 1mm, so the estimated reading of the ruler is the next decimal of the scale value. Note that when using a steel ruler to measure the length, try not to use the "0" scale as the zero point, so that it is easy to align the non-cross-sectional position, resulting in artificial measurement errors of the reading.

The above is the detailed introduction about the specifications of steel ruler. Although the steel ruler is just a very common measuring tool, and the structure is also simple. But the maintenance of steel rulers is also very important. Because the steel ruler is a measuring tool, and it is also made of special metal, it should not be placed in a humid or acid gas place during storage to prevent the steel ruler from being corroded or rusted. After the steel ruler is used, the dust, greasy and other contaminants on the steel ruler must be wiped clean, and the motor oil can also be used for wetting and stored in a dry environment.

Quality Series Caster

Quality Series caster

Quality series caster

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