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Laser tracker has been widely applied in the field of long rails geometric tolerance measurement due to high precision, ease of use and other reasons. Round rail levelness measurement is used to be calculated by means of electronic level using the pitch method which is more cumbersome and error-prone. Based on the analysis of laser tracker leveling principle, we propose a new method using laser tracker measuring the level of the long cylindrical guide rail. With a project example, cylindrical guide rail located at altitude of 5m and 16m in length were proceeded for level measurement and the measured level of the long cylindrical guide rail is 0.03mm/m. The method broadened the field using a laser tracker. By using the laser tracker measurement principle in long long cylindrical guide rails levelness, it can also be applied to the parallelism, squareness, inclination and other measurement.

Testing levelness error of long cylindrical guide rail by laser tracker