The bridge type ruler shall not have defects such as sand holes, air holes, cracks, slag inclusions, shrinkage porosity, scratches, bumps, rust spots, etc. that seriously affect its appearance and performance. Type bearings are large and heavy, expensive in value, and mostly produced in single or small batches. They are also products or important engineering accessories with tight delivery times, and belong to high-precision and cutting-edge technology products. Measuring it requires the use of measurement methods and tools. The standard parts of its inner diameter, outer diameter, raceway, and inner cone are replaced with bridge type rulers equipped with side blocks, which can achieve the effects of simple operation, convenient use, accurate measurement, and economic savings. Therefore, the bridge type ruler is selected as a commonly used measuring tool in the production of bearings, and it is extremely necessary to master the detection method of this measuring tool.

Working principle

Bridge level ruler is a flat gauge with a flat surface, mainly used to inspect the flatness of flat plates, long guide rails, etc. by coloring method and indicator table method. It is also commonly used to inspect the straightness of workpiece edges by optical gap method. It is generally made of cast iron, and rectangular level rulers are also made of bearing steel or granite.

Repair and maintenance

The bridge level ruler is easy to store and can be hung and placed flat, without affecting its straightness and parallelism due to long-term placement. The bridge type ruler is not easy to rust when stored, and does not need to be oiled during use. If not used for a long time, a thin layer of general industrial oil should be coated when stored to prevent rusting and affect accuracy.

Industry News

In order to reduce the production cost of bridge type rulers and make the selling price of bridges competitive in the market, 79.8% of bridge type ruler manufacturers adopt the manual scraping and grinding process. Although manual scraping and grinding are relatively backward, for bridge level rulers, it is an irreplaceable machining process that cannot be replaced by any mechanical processing when high precision is required. In order to improve the service life and working accuracy of the bridge level ruler, it is recommended to control the scraping and grinding to be above 0.02mm, which can prolong the service life and calibration cycle of the bridge level ruler. According to relevant information on scraping and grinding, as well as data obtained from scraping and grinding measurements, the processing requirements of this process can be met. The appearance of the bridge type ruler shows vibration patterns, increasing the roughness of the product surface, affecting accuracy and aesthetics. After the scraping and grinding process, the above problems rarely occur. To prevent small local distortions on the working surface of the bridge level ruler and improve its accuracy in use. Check the micro quality of the working surface of the bridge type ruler, that is, the flatness of the small peaks and valleys, and the micro surface, in order to ensure the service life of the bridge type ruler.

matters needing attention:

Before work, check the tools and strictly prohibit the use of unqualified tools such as corrosion, deformation, looseness, malfunction, damage, etc.