ANALYSIS OF HIGH-SPEED MULTI BEARING SPINDLE SYSTEM
Keywords:
Spindle, Stiffness of bearing, Radial reaction, Torque, Deflection.Abstract
One of the most critical components of any high speed spindle design is the bearing
system. Our design requirements state that the spindle must provide high rotational speed, transfer
torque and power to the cutting tool, and be capable of reasonable loading and life. Deflection of the
spindle system depends on the applied load and stiffness of the bearing. Stiffness of the bearing in
turn depends on radial reaction at the bearing and location of the bearing. Estimation of the accurate
bearing stiffness plays equal importance in finding deflection of the spindle system. In conventional
method the stiffness of the bearing is computed by approximately radial reaction, the obtained
stiffness is assumed to be constant and computed stiffness input in to the model. A new method is
such required for considering precise inter dependence of spindle shaft deflection and bearing
stiffness. The objective of the project is to develop a method iteratively to compute the appropriate
spindle deflection, bearing reaction and bearing stiffness by varying required bearing number and by
varying the span bearing span.
