A detailed introduction to the line rule

Type and use

Line grain scale can be divided into reference line grain scale, standard line grain scale and working line grain scale.

Reference and standard line scales: transfer of quantity values for length measurement.

Working line rule: Used for measuring instruments and precision machine tools measurement positioning use. Specifically, it can be used as a measurement and calibration optical component in length measuring tools such as length comparator, length measuring machine, universal tool microscope, universal measuring machine, etc. It can also be used as optical positioning element in precision machine tools such as jig boring machine and coordinate grinding machine.

Second, material and manufacturing

The wire grain scale used for quantity transfer, such as the reference wire grain scale and the standard wire grain scale, is generally made of alloy containing 58% nickel and 42% iron, and the linear expansion coefficient of this material is the same as that of steel, 11.5×10 (-6) /℃.

The working wire rule, such as the working wire rule mentioned above, is generally made of glass (such as soda glass, quartz glass, K9 glass, etc.), and its linear expansion coefficient is close to that of steel.

Other materials for manufacturing wire rule are stainless steel, ordinary steel rule nickel plating, chrome plating, etc.

Third, specifications and accuracy

The common wire gauge specifications in mechanical manufacturing are 100, 200, 300, 500 and 1000 mm.

The allowable calibration error of the reference line scale is ±0.2 micron /1000 mm.

The allowable calibration errors of 1, 2 and 3 standard metal wire lines within 1 meter are ±(0.1+0.4L) micron, ±(0.2+0.8L) micron and ±(5+10L) micron, respectively.

The allowable calibration error of 1 and 2 standard glass wire scales within 1 meter is ±(0.1+0.5L) micron and ±(0.2+1.5L) micron, respectively. Where L is the distance (m) of the detected line.

The line engraving accuracy of the working line gauge can reach ±1 micron /1000 micron or higher.

4. Methods of use

There are a variety of ways to use the line ruler, and the following are several common methods:

Sliding method: Put the line ruler on the surface of the object, and slowly slide the ruler to the object with your fingers, then the line grain on the ruler will be carried by the feature line on the surface of the object, and then measure the size of the object according to the scale on the ruler.

Projection method: The line grain ruler is placed on a white board or paper, a laser projection device is placed in a fixed position, and the lines are shot across the line grain ruler, when the object is projected on the line grain on the ruler, the size of the object can be measured.

Curve and arc measurement: The line ruler can also be used for accurate measurement of curves and arcs. It can place an accurate curve or arc on the surface of the line ruler, and then slide the line ruler with your finger to accurately measure the shape and size of the curve and arc.

Maintenance and maintenance

After the wire rule is used, it should be cleaned and wiped clean, and then coated with anti-rust oil.

When not in use, it should be placed in a special wooden box to avoid bending and deformation.

Where the wire rule is stored, the temperature should be within the range of 8 to 30℃, and the relative humidity should generally not exceed 65%.

Vi. Verification

As a high precision measuring tool, the line gauge needs to be verified regularly to ensure its accuracy. The verification items usually include appearance, width and quality of the cutting line, roughness of the cutting surface, flatness of the cutting surface, straightness of the edge and flatness of the bottom of the cutting line. The specific verification methods and requirements will vary according to the grade and use of the wire gauge.

To sum up, the wire scale is a high-precision, multi-functional measuring tool, widely used in a variety of measurement and inspection work. By understanding its type, material, specifications, accuracy, use methods and maintenance and other aspects of the knowledge, you can better play the role of the wire grain and extend its service life.