With precision machining, not all materials can be precision machined. Some materials are too hard and exceed the hardness of the machine parts and they may collapse. Therefore, these materials are not suitable for precision machining unless they are special. Made of material, or laser cut.

Materials for precision machining are divided into two major categories, metallic and non-metallic materials.

For metals, hardness is the largest in stainless steel, followed by cast iron, followed by copper, and finally aluminum.

The processing of ceramics and plastics is the processing of non-metallic materials.

1. The first is the requirement for material hardness. For some applications, the higher the hardness of the material, the better. It is only limited to the hardness requirements of the processing machine parts. The processed materials cannot be too hard. If they are harder than the machine parts, they cannot be processed.

2. Secondly, the material is moderate in hardness and softness, at least one grade lower than the hardness of the parts, and at the same time, it depends on what the components of the processing are used for, and the components are selected reasonably.

In short, there are still some requirements for precision machining on the material. Not all materials are suitable for processing. For example, the material is too soft or too hard. The former is not necessary for processing, while the latter cannot be processed.

Therefore, the most basic one is to pay attention to the density of the material before processing. If the density is too high, it is equivalent to a large hardness, and if the hardness exceeds the hardness of the machine (lathe turning tool), it cannot be processed. It can only damage the parts and can also cause dangers, such as the tool blade flies out and hurts people. Therefore, in general, for mechanical processing, the material material is lower than the hardness of the machine knife so that it can be processed.