When it comes to CNC milling machine parts, there are various surface finishes that can be achieved. These finishes can impact the functionality of the part, as well as its overall appearance. Here are some of the most common types of surface finishes:
1. Ra Surface Finish
Ra surface finish is a measurement of the roughness of the surface. It is typically measured in micrometers (μm) or microinches (μin). The lower the Ra value, the smoother the surface. This type of finish is ideal for parts that require a high degree of accuracy and precision. It is commonly used in applications where the part needs to have tight tolerances, such as in the aerospace industry.
2. RMS Surface Finish
RMS surface finish is another way to measure the roughness of a surface. It stands for Root Mean Square and is also measured in micrometers or microinches. This type of finish is typically used for parts that require a high level of functionality, such as gears or bearings. The RMS value is calculated by taking the square root of the average of the squares of the surface profile heights. The lower the RMS value, the smoother the surface.
3. Machined Finish
A machined parts finish is a type of surface finish that is achieved by using a cutting tool to remove material from the surface. This finish is typically used for parts that do not require a high degree of accuracy or precision. Machined finishes are often used in applications where the part will be painted or coated, as the finish will not be visible once the part is finished.
4. Polished Finish
A polished finish is achieved by using a polishing tool to buff the surface to a high shine. This type of finish is typically used for parts that will be visible or require a decorative finish. Polished finishes are often used in applications where the part will be on display or needs to have a high aesthetic value.
5. Brushed Finish
A brushed finish is achieved by using a wire brush to create a pattern on the surface. This finish is typically used for parts that require a textured or decorative finish. Brushed finishes are often used in applications where the part needs to have a unique appearance or texture.
In conclusion, the type of surface finish used on CNC milling machine parts can impact the functionality and appearance of the part. It is important to carefully consider the requirements of the part before selecting a surface finish. By choosing the right finish, you can ensure that your part meets its intended purpose and looks great too.
