What is the role of steel ruler?

Release time:

2023-09-07

Steel ruler is the basic measuring tool, it is generally used for high precision, thin steel plate made of ruler, can directly measure the size of the workpiece. The steel ruler has different lengths. In automobile maintenance work, it is often used to measure the flatness error of the cylinder head or cylinder block.

Before using the steel ruler, it is necessary to check whether the edge of the steel ruler and the scale line are in good condition and accurate, and at the same time, it is necessary to ensure that the surface of the steel ruler and the measured object is clean, smooth, and cannot be bent or deformed.

When measuring the steel ruler, the zero scale to be selected coincides with the starting point of the measured object, and the steel ruler is tightly attached to the measured object, which can increase the measurement accuracy. Similarly, the ruler can be turned 180 degrees and then measured again, and then the average value of the two measured results is taken, so that the deviation existing in the steel ruler itself can be eliminated.

The scale of the steel ruler is engraved on one or both sides of the ruler, and the scale on one side can be engraved on the upper and lower sides of the ruler surface or only on the lower side of the ruler surface. A steel ruler at the working end is continuously engraved with five additional millimeter divisions outside the final division of the fixed length. The ruler has a number in centimeters, the name of the manufacturer, or a trademark. The back of the ruler is smooth, and some are also engraved with various formulas or other attached text. The dividing value of the steel ruler is 1mm, and the 150mm steel ruler is allowed to add a scale of 0.5mm within the initial 50mm length of the engraving line. The manufacturing accuracy of the steel ruler, the total length, centimeter division, millimeter division, half millimeter division and the error of any intermediate engraving line to the working end or end engraving line of the ruler.

The lines on the steel ruler are mechanically rolled up.

In the past, steel rulers were made by hand by fitters with high precision. Now they are processed in batches by machines.

However, the particularly precise platform of the fitter tool, such as the guide rail of the machine tool, and the fitter marking platform are all manually ground by the fitter.

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