在机床修理和安装中,大直径圆导轨平直度误差的测量一直被认为是颇为困难的工作。用半径桥板和水平仪测量的方法在生产中早有使用,在《机修手册》等资料中也有过介绍。实践表明,这种测量方法具有快速与精确的优点, In the repair and installation of machine tools, the measurement of the straightness error of large diameter circular guideway has been considered as a rather difficult task. The method of measuring with radius bridge plate and spirit level has been used in the production for a long time, and has also been introduced in the information such as “mechanic manual”. Practice shows that this measurement method has the advantages of fast and accurate,