What are the materials requirements from precision CNC machining ?

With the changes of the times, many things have gradually changed with the times. For example, our precision machining is the same. The materials used in it are all required. Not all materials are suitable. , we have to choose the right one, then what are the requirements for precision machining?
    Precision machining, not all materials can be precision machined. For example, if the hardness of the material exceeds the hardness of the machined parts, some special materials are not suitable for precision precision machining.
    The first is the hardness of the material. For some occasions, the higher the hardness, the better. It is only limited to the hardness requirements of the machined parts. The processed material should not be too hard. If it is harder than the parts, it cannot be processed.     Secondly, the material is moderately soft and hard, at least one grade lower than the hardness of the machine. At the same time, it depends on what the function of the processed device is, and the material is reasonably selected.
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