Evaluation and correction methods for geometric errors of hydrostatic thrust bearings

Abstract The value and direction angle of the perpendicularity error of the thrust surface and bearing bush in hydrostatic thrust bearings directly affect the motion accuracy. In this paper, a rapid onsite measurement method and evaluation model for the value and direction angle of the perpendicularity error of the thrust surface and bearing bush in hydrostatic thrust bearings are presented. The method is validated by comparing experimental measurements with those obtained using a CMM. An analysis of the perpendicularity errors before and after correction shows that at different speeds (10 rpm, 30 rpm, and 50 rpm), the errors in the mean axial and tilt displacements of the thrust bearing are reduced by 68.41% and 35.44%, respectively.