即便是小型加工中心的保养能够及时到位，在机床长时间使用后其ntn轴承精度也会出现精度超差等现象的发生。概括起来影响机床主轴变形的因素主要有磨损造成的变形、摩擦热造成的变形以及机床主轴轴承安装不规范造成的变形等三种。
Even if the maintenance of small machining centers can be in place in time, the NTN bearing accuracy of the machine tool after a long time of use will also appear in excess of the phenomenon of precision. Generally speaking, there are three main factors affecting the deformation of machine tool spindle: the deformation caused by wear, the deformation caused by friction heat and the deformation caused by non-standard installation of machine tool spindle bearings.
1、机床安装不规范造成的变形（Deformation caused by irregular installation of machine tools.）
新机床的安装地基和位置对机床加工精度的保持有着重要影响。特别是地基松软下沉对机床的水平有着破坏性的影响，首先会导致轴承在机床不平衡重力的影响下发生加工变形，如果这种状态持续一定时间后，会造成轴承主轴扭曲不可逆的变化，最终导致小型加工中心加工精度超差。
The installation of foundation and location of new machine tools has an important influence on the accuracy of machine tools. Especially the soft subsidence of the foundation has a destructive effect on the level of the machine tool. First of all, the bearing will be deformed under the influence of the unbalanced gravity of the machine tool. If this state lasts for a certain period of time, it will cause irreversible change of the spindle distortion of the bearing, and ultimately lead to the machining accuracy of the small machining center is beyond the limit.
2、ntn轴承磨损造成的变形（Deformation caused by wear of NTN bearings）
磨损几乎是伴随着机床的整个生命周期，对小型加工中心也不例外，不过这种自然磨损具有一定的稳定性。但是如果是润滑油量过低或者缺失将会导致ntn轴承的急剧磨损，这种非自然的磨损对机床轴承的损坏将是不可逆。只有通过大修的方式恢复轴承的加工精度及直线度才可彻底修复。
Wear is almost accompanied by the whole life cycle of machine tools, small machining centers are no exception, but this natural wear has a certain stability. But if the lubricating oil is too low or missing will lead to the rapid wear of NTN bearings, the abrasive wear of machine tool bearings will be irreversible. only by repairing the bearing's machining accuracy and straightness by overhaul can it be completely repaired.
3、ntn轴承摩擦热造成的变形（Deformation caused by friction heat of NTN bearing）
机床ntn轴承在工作过程中由于工件的负荷、轴承滚动体与内外圈之间的摩擦的原因会引起温度升高，从而导致轴承因受热发生膨胀而产生变形。如在润滑油量充足、有效的情况下，这种受热变形都可以得到有效遏制。怕就怕上述第二种情况下的润滑油缺失造成的干磨，这种状态下不仅会产生轴承滚道磨损脱销，还将产生大量的摩擦热，造成ntn轴承损坏和提前失效。
The NTN bearing of machine tool will cause the temperature to rise because of the workpiece load and the friction between the bearing roller and the inner and outer rings, which will lead to the deformation of the bearing due to the expansion of heating. If the amount of lubricating oil is sufficient and effective, the thermal deformation can be effectively curbed. Afraid of the second case of the above lubricant loss caused by dry wear, this state will not only produce bearing raceway wear and tear off, but also produce a lot of friction heat, causing NTN bearing damage and early failure.