直線導軌滑塊的作用有：1、工作精度高：直線導軌的運動由滾動來實現，不僅摩擦系數降至滑動導軌的1/50，動、靜摩擦阻力的差距亦變成很小，實現運動平穩。

The functions of the linear guide slider include: 1. High working accuracy: The motion of the linear guide is achieved by rolling, which not only reduces the friction coefficient to 1/50 of the sliding guide, but also reduces the difference between dynamic and static friction resistance, achieving smooth motion.