Technical requirements for the base of a coordinate measuring machine
I. Hard Technical Specifications for Substrate Material (Mandatory for High-end CMM)Select semiconductor-grade dense gabbro (Jinan Green / Indian Black Granite); ordinary porous stone is strictly prohibited:Coefficient of Thermal Expansion (CTE): 2.5–3.8×10⁻⁶/℃, only 1/4 of steel and 1/6 of aluminum alloy; deformation of a 1m base per 1℃ temperature difference ≤0.4μm, eliminating measurement drift caused by…