ABSTRACT
Assuming that the stiffness of the supported bearing and the bearing seat of the screw are equal, then:
k k k ks s sz s2 1 2z, (3)
2 BALL SCREW TORSIONAL STIFFNESS MODEL
The torsional stiffness of ball screw reflects the ability to resist the torsion of the feed system, and based on the torsion theory, the torsional stiffness model of the feed system can be obtained:
1 1 1 1 1 1
1 2k k k k k kNS s n = + + + +
Where kNS represents the torsional stiffness of the ball screw; klφ represents the torsional stiffness of the nut assembly; kφ1 represents the torsional stiffness of the left bearing of the screw; kφ2 represents the torsional stiffness of the right bearing of the screw.
