机械加工的精度 机械加工的精度，主要是体现在以下这几个方面，为尺寸精度、几何形状精度和相互位置精度，其中几何形状精度包括圆度、直线度以及平面度等，相互位置精度包括平行度、垂直度以及同轴度等。
The accuracy of machining the accuracy of machining is mainly reflected in the following aspects: dimensional accuracy, geometric accuracy and mutual position accuracy. The geometric accuracy includes roundness, straightness and flatness, and the mutual position accuracy includes parallelism, verticality and coaxiality.
内容三：获得机械加工精度的方法有哪些？ 尺寸精度：主要有试切法、调整法、定尺寸法以及自动控制法等这些方法。 几何形状精度：主要有轨迹法、成型法以及展成法等这些方法。 相互位置精度：主要有直接安装法、找正安装法以及夹具安装法等这些方法。
Content 3: what are the methods to obtain machining accuracy? Dimensional accuracy: there are mainly trial cutting method, adjustment method, sizing method and automatic control method. Geometric accuracy: there are mainly trajectory method, forming method and generation method. Mutual position accuracy: there are mainly direct installation method, alignment installation method and fixture installation method.