What Are The Differences Between Rough Machining And Finish Machining?

DALIAN, China - Sept. 18, 2023 - PRLog -- After the workpiece goes through "rough machining" in CNC machining, it is already close to the desired shape and dimensions. However, there is still sufficient metal allowance left on the machined surface for finishing, which results in a smooth surface and accurate dimensions of the workpiece.

In the CNC machining process, steel bars, forgings, castings, and similar materials often only require one round of rough machining and one round of finish machining to achieve the required shape and dimensions. Nevertheless, certain parts of mechanical components might require more than one round of rough machining at times. Some hardware parts, for instance, those with lower precision requirements or needing minimal metal removal, might only necessitate a single round of finish machining.

So, what are the specific differences between rough machining and finish machining?

Purpose of Machining:

Rough Machining:

Rough machining is the initial stage of machining aimed at efficiently removing excess material from the workpiece to gradually approach the final shape. This process emphasizes rapid material removal and is often used to reduce the workload of subsequent machining steps.

Finish Machining:

As the name suggests, finish machining is the final stage of machining. It involves removing a small amount of material to achieve the required surface quality, dimensional accuracy, and precise geometric shape according to design specifications.

Material Removal:

Rough Machining:

In rough machining, larger cutting depths and higher feed rates are used to quickly remove material. The focus is on efficient removal of a significant amount of material, which may result in higher surface roughness.

Finish Machining:

Finish machining employs smaller cutting depths and lower feed rates to achieve high-quality surface smoothness. This stage aims to eliminate tool marks or defects left from rough machining.

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