How to measure the accuracy of marble platforms

Measurement and protection of marble platform: The marble platform is a detailed benchmark measurement object for granite material, and the honing of the instrument panel, detailed object, and mechanical parts are all fantasy reference planes. Especially for measurement, due to its characteristics, cast iron plates pale. Dali stone slab is a slab made of marble material, and the demonstration material used is solid marble, with dense particles and dense structure, such as granite, diabase, gabbro, etc