精密机械加工的工艺效果是：
The technological effects of precision machining are as follows:
①零件的几何形状和相互位置精度达到微米或角秒级；
The accuracy of geometric shape and position of parts reaches micron or angular seconds.
②零件的界限或特征尺寸公差在微米以下;
(2) The tolerance of the part's boundary or characteristic size is below micron;
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 micro-roughness (average height difference of surface roughness) of parts is less than 0.1 micron;
④互配件能满足配合力的要求；
(4) Inter-fittings can meet the requirements 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；
(5) Some parts can also meet the requirements of precise mechanical or other physical characteristics.