Optical platform marble platform crossed platform test platform

Introduction marble slab known as granite slab, flat rock, marble platform [1], granite platform, the rock platform. Using precision reference measurement tools, made of natural stone, used in instrumentation, precision tools, machinery parts face flatness test, particularly for high-precision measurements. Marble slab made of high quality "Jinan Green" "Green Mountains" "Tarzan plainer pill" and other stone grinding machined and hand-made, high surface finish, said to the measurements can move smoothly, without Zhise sense. These stones are equipped with black gloss, structural precision, even texture, good stability, high strength, high hardness, and with acid, wear resistance, not magnetized, the same type and so it can work in a wider conditions in normal use. Features 2 Features marble platform mainly accuracy and stability, easy maintenance. This is because: ① marble platform structure dense, smooth surface wear-resistant, low roughness value; ② marble through a long-term natural aging, internal stress completely disappeared, material stability, not deformed; ③ acid, alkali, corrosion resistance, magnetic; ④ not damp rust, use, easy maintenance; ⑤ linear expansion coefficient, little affected by temperature; ⑥ Face after an impact or scratches, will produce pits, no ridges, burrs, measurement Accuracy has no effect. Flat Rock main disadvantage is that not to put too much impact, beat, high humidity may be deformed, moisture absorption of 1%. 3 flatness and proportion flatness tolerance according to: GB4987-85 Standard: 000 = 1 × (1 + d / 1000) um 00 级 = 2 × (1 + d / 1000) um marble platform 0 = 4 × (1 + d / 1000) um 级 1 = 8 × (1 + d / 1000) um (d diagonal mm) (measured temperature is generally 20 ± 2 ℃) marble slab gravity: 2970-3070kg / m Compressive strength: 245-254N / m linear expansion coefficient: 4.61 × 10-6 / ℃, water absorption: <0.13% Shore Hardness: Hs70 above