加工精度达到 1微米的机械加工方法。精密机械加工是在严格控制的环境条件下，使用精密机床和精密量具和量仪来实现的。加工精度达到和超过 0.1微米称超精密机械加工。

The machining accuracy is 1 microns. Precision machining is achieved by using precision machine tools, precision measuring tools and measuring instruments under strict control of environmental conditions. The machining accuracy is over 0.1 microns, which is called ultra precision machining.

精密机械加工的工艺效果是：

The technical effect of precision machining is:

①零件的几何形状和相互位置精度达到微米或角秒级；

1. The accuracy of parts geometry and location is up to micron or sec.

②零件的界限或特征尺寸公差在微米以下;

2. The tolerance of parts or dimensions is below microns.

③零件表面微观不平度(表面不平度平均高度差)小于0.1 微米;

(3) the surface roughness (the average height difference of surface roughness) is less than 0.1 microns.

④互配件能满足配合力的要求；

(4) the mutual fitting can meet the requirement of combining ability.

⑤部分零件还能满足精确的力学或其他物理特性要求；

Part of the parts can also meet the requirements of precise mechanics or other physical properties.