A vibration monitoring and analysis method based on RMS vibration value and spectrum analysis is proposed to solve the problem of non-stationary characteristics of mechanical spindle in CNC machine tools and the monitoring of spindle running state. In this paper

the research is carried out on a mechanical spindle of a gantry machine tool. The vibration velocity value of the vibration tester is selected for rapid state identification. After the abnormality is found

the bearing of the important component of the spindle is continuously monitored

and the defect position of the bearing is diagnosed by spectrum analysis. The results show that the vibration monitoring and analysis method can quickly and effectively diagnose the fault position of the mechanical spindle

and take measures in advance to avoid further deterioration of the fault.