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Surface finish grade in CNC machining


Surface finish grade in CNC machining refers to the level of smoothness, texture, and accuracy of the surface of a machined part. The surface finish grade is often specified using a measurement system known as Ra or roughness average. Ra is the average deviation of the surface features from the mean line, measured in micrometers (μm) or microinches (μin).

In CNC machining, the surface finish grade is influenced by several factors, including the cutting speed, feed rate, tool geometry, material properties, and coolant/lubricant used during machining. The surface finish grade can have a significant impact on the functional and aesthetic qualities of the final product, such as its wear resistance, corrosion resistance, and visual appeal.

Surface finish grades typically range from rough to mirror finish, with each grade having specific Ra values. For example, a rough finish may have an Ra of 50-100 μm, while a mirror finish may have an Ra of less than 0.2 μm. The surface finish grade required for a particular application depends on factors such as the part's function, material, and aesthetic requirements.

In summary, surface finish grade in CNC machining is an important aspect of the manufacturing process that determines the quality and functionality of the machined parts. It is typically specified using a measurement system such as Ra and is influenced by various factors that need to be carefully considered during the machining process.

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