In modern engraving machines, granite platforms are widely used as the base of machine tools. Engraving machines integrate multiple functions such as drilling and milling, requiring extremely high precision and stability. Compared to traditional cast iron beds, granite platforms offer advantages such as high precision, minimal deformation, excellent wear resistance, and high compressive strength. Therefore, they can significantly improve machining accuracy and long-term stability in engraving machines.
Granite platforms are made from natural stone. After hundreds of millions of years of natural weathering, their internal structure is stable and stress-free. They are rigid, non-deformable, rust-resistant, and acid-resistant. Furthermore, they are relatively easy to maintain, requiring less frequent maintenance than cast iron platforms. During machining, for Grade 0 and Grade 1 precision granite components, threaded holes or grooves on the surface must not be positioned above the work surface. Furthermore, the work surface must be free of defects such as pinholes, cracks, scratches, and impacts to ensure accuracy and performance. When testing the flatness of the work surface, the diagonal or grid method is typically used, with surface undulations recorded using a spirit level or indicator gauge.
In addition to being a crucial component of the engraving machine bed, granite platforms are also commonly used for parallelism testing of linear guideways. High-precision granite platforms are typically machined from high-quality granite such as “Jinan Green.” Their stable surface and high hardness provide a reliable reference for guideway testing.
In actual testing, a granite platform of appropriate specifications should be selected based on the length and width of the guideway, and used in conjunction with measuring tools such as a micrometer and electronic level. Before testing, the platform and guideway should be cleaned to ensure they are free of dust and oil. Next, the reference surface of a granite level is placed as close as possible to the linear guideway, and a bridge with an indicator is placed on the guideway. By moving the bridge, the indicator readings are read and recorded point by point. Finally, the measured values are calculated to determine the parallelism error of the linear guideway.
Due to their excellent stability and high precision, granite platforms are not only a crucial component of engraving machines but also an indispensable measuring tool for testing high-precision components such as linear guideways. Therefore, they are widely favored in mechanical manufacturing and laboratory testing.
Post time: Sep-19-2025