The motion, vibration, noise and other performance of the ball in the rolling linear guide pair are closely related. Normally, the motion state of a rolling linear guide pair is that the guide rail remains stationary, the slider moves in a straight line, and the ball rotates around its own axis while rolling around the raceway. The spin, slip, and other motions of the ball have a significant impact on the friction characteristics of the rolling linear guide pair. The analysis of the motion of the ball is one of the theoretical foundations for studying the performance of the rolling linear guide pair. The following briefly introduces the motion relationship between the slider and the ball in the guide rail pair, and analyzes the various motion situations of the ball in the bearing area.

1. The basic motion relationship in the rolling linear guide pair: When the ball moves in the construction area, it is not simply rolling, but a combination of various spatial movements.

2. The sliding motion of the ball refers to the sliding of the steel ball in the bearing area around the normal direction of the contact surface, in addition to rolling and rotating along the sliding direction of the slider. The sliding of the ball, also known as the wedge effect, will increase the contact load of the ball, resulting in a change in the friction characteristics of the rolling linear guide pair.

3. The gyroscopic motion of the ball is due to the non-zero contact angle of the linear rolling guide, and the direction of the ball's rotation axis constantly changes, thus being subjected to the gyroscopic moment, resulting in gyroscopic motion.

4. Spin motion of balls: The motion of balls in a linear rolling guide pair is three-dimensional. If the contact angle is not equal to zero, the balls will spin around the normal of the contact point. The spin motion has a significant impact on the formation of the hydrodynamic lubricating oil film and the magnitude of the frictional force in the guide rail pair.