滚动导轨根据是否预加载，滚动导轨可以分为预加载和无预加载两类。
预加载的优点是提高了导轨的刚度，适用于颠覆力矩较大和垂直方向的导轨中，数控机床的坐标轴通常都采用这种导轨。
无预加载的滚动导轨常用于数控机床的机械手、刀库等传送机构。
补充:数控机床还普遍采用一种滚动导轨支撑块，它已做成标准部件，其特点是刚度高，承载能力大、便于拆装，可直接装在任意行程长度的运动部件上。
优点:
优点:1、灵敏度高，且其动摩擦与静摩擦系数相差甚微，运动平稳，低速移动时不易出现爬行现象。
2、定位精度高，重复定位精度可达0.2μm。
3、摩擦阻力小，移动轻便，磨损小、精度保持性好。
缺点:滚动导轨的抗震性较差，对防护要求较高。
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