必须针对不同的零件外形、尺寸和精度要求，采取相应的工艺方法和装备来保证零件的顺利加工。
So taking proper technological methods, jig and fixture is very important to assure parts' processing, according to different shape, dimension, and accuracy.
应用数控机床加工零件，当零件外形简单，编程时可设置一次工件坐标系（编程原点），即可完成零件的加工；
When using CNC machines to process the part, it can set the part reference frame (the origin of programming) once to complete the process if the outline of part is simple.
基本上你需要决定的就是外形、零件的位置和如何将各个零件连接在一起。
Basically all you need to decide is shape, location of all parts, and how to connect the parts together.
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