Which is better, marble platform or cast iron platform

The difference between cast iron platforms and marble platforms lies in the materials and processing methods used. The accuracy of cast iron platforms is divided into levels 1, 2, and 3, while the accuracy of marble platforms is level 0, 00, and 000. However, the resistance to impact of cast iron platforms is better than that of marble platforms. Cast iron platforms are suitable for industry, such as marking lines by fitters, inspection and maintenance of workpieces. Many school laboratories use marble platforms as testing tools for experiments. What are the characteristics of cast iron plates: After wear and tear, cast iron plates can be re scraped to restore their accuracy. Cast iron flat plates can be inspected for flatness using the coloring method, which has the advantages of accuracy, intuitiveness, and convenience. Pushing the gauge seat and workpiece smoothly on the scraped cast iron flat plate without any feeling of roughness, facilitates measurement. The quality of cast iron and heat treatment of cast iron flat plates have a significant impact on their performance, or the working surface may deform due to residual large internal stresses; Or due to difficulty in scraping, roughness with small values cannot be obtained. Therefore, when using cast iron plates, pay attention to the selection of cast iron materials. What are the characteristics of marble slabs: The main features of marble slabs are stable accuracy and easy maintenance. This is because: ① The structure of the marble slab is dense, the surface is smooth, and the roughness value is small; ② After long-term aging, the internal stress of the rock disappears, the material is stable, and it will not deform; ③ Acid resistant, alkali resistant, and magnetic resistant; ④ Will not get damp or rust, easy to use and maintain; ⑤ Small coefficient of linear expansion, less affected by temperature; ⑥ After collision or scratch on the working surface, only pits will be formed, without any protrusions or burrs, which has no impact on the measurement accuracy. The main disadvantage of marble slabs is that they cannot withstand excessive impact and knocking, and high humidity can cause deformation