直线导轨滑块的作用有：1、事情精度高：直线导轨的运动由转动来实现，不但摩擦系数降至滑动导轨的1/50，动、静摩擦阻力的差别亦酿成很小，实现运动平稳
。

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.