The guide oil containing polar additives is used on the linear guide rail; The stiffness of the system is improved by reducing the joint surface, increasing the structure size, shortening the transmission chain and reducing the transmission pair.

在可能的情況下，應盡量增加軌的工作長度，這是因為增長后，不但可使直線導軌表面接觸變形引起的動導軌偏轉角減小，而且還使直線導軌各處壓力均勻。

If possible, the working length of the rail should be increased as much as possible. This is because the increase can not only reduce the deflection angle of the moving rail caused by the contact deformation of the linear rail surface, but also make the pressure of the linear rail uniform.

為了提高直線導軌導軌副之間的耐磨性和防止咬焊，動導軌和支承導軌的材料禁忌相同，原則上是一硬一軟。如果材料相同，也一定采用不同的熱處理方法，使雙方硬度不同。

In order to improve the wear resistance and prevent the biting welding between the linear guide rail pairs, the materials of the moving guide rail and the supporting guide rail are the same, in principle, one is hard and one is soft. If the materials are the same, different heat treatment methods must be adopted to make the hardness of both sides different.

在直線導軌副中，支承直線導軌一般采用淬火鋼或淬火鑄鐵，動導軌多采用塑料軟帶導軌。在高精度機械系統中，一對直線導軌副均用不淬火的耐磨鑄鐵材料，這是因為各導軌需進行刮研精加工，而對于不太重要或不常運動的導軌副則使用普通的灰鑄鐵材料。

In the linear guide pair, the supporting linear guide generally adopts quenched steel or quenched cast iron, and the moving guide mostly adopts plastic soft belt guide. In the high-precision mechanical system, a pair of linear guide pairs are made of non quenched wear-resistant cast iron. This is because each guide needs to be scraped and polished. For the guide pairs that are not very important or often move, ordinary gray cast iron is used.

此外，應注意直線導軌的硬度一般應比支承導軌的硬度要低。長直線導軌的耐磨性和硬度比短直線導軌要高，因為長導軌各處的使用情況不等，所以磨損程度也就不一樣，而不均勻的磨損對加工精度的影響又很大，并且長導軌不易做到完全防護，受到意外刮傷的機會也多。

In addition, it should be noted that the hardness of linear guide is generally lower than that of supporting guide. The wear resistance and hardness of the long linear guide are higher than that of the short linear guide. Because the use of the long guide varies from place to place, the wear degree is different. The uneven wear has a great impact on the machining accuracy, and the long guide is not easy to be completely protected, and there are many chances of accidental scratches.