Dynamic support stiffness of motorized spindle bearings under high-speed rotation

The rotor operating stiffness of high-speed motorized spindles (HSMSs) is key to machining accuracy. Because HSMSs are difficult load due their high speeds, a contact loading device was developed test stiffness. dynamic support the front/rear bearings (DSSB) main factor affecting Two novel experimental schemes for measuring DSSB proposed: (1) indirect measurement—by analysing deformation displacements at two points on external rod HSMS and (2) direct eddy current sensors installed near bearings. Based schemes, influences working condition parameters were tested. results show that proposed can effectively accurately measure speeds up 30,000 rpm. However, because tapered connection gap between increases measured displacement, by measurement scheme relatively small. decreases with speed radial force temperature. This study provides new basis quality inspection finished verification theoretical bearing models.