用花岗岩制造平板、角尺及阶梯规等精密工具已有较长的历史。由于花岗岩具有稳定性好、耐磨、绝缘性好、抗振、阻尼系数大与热胀系数小等优点,再加上石材加工技术的发展,近十年来它已广泛用来做精密机械的基础件。如价值昂贵的三座标测量机工作台、立柱导轨、横梁等都用花岗岩 There have been a long history of using granite to make precision tools such as plates, square corners and step gauges. Because granite with good stability, wear resistance, good insulation, anti-vibration, large damping coefficient and thermal expansion coefficient of small advantages, coupled with the development of stone processing technology, the past 10 years it has been widely used to do the basis of precision machinery Pieces. Such as the expensive three coordinate measuring machine table, column rails, beams, etc. are used granite