Main principle of micromilling is similar to that of conventional cutting operations, in particular, the surface of the workpiece is mechanically removed using microtools. However, unlike conventional macro-machining processes, micromilling displays different characteristics due to its significant size reduction.

Next, major distinguishing factors between micro and macro milling are studied, such as, specific cutting energy, minimum chip thickness, surface roughness, burr, microstructure effect, tool wear, modeling, sensing and monitoring methods.

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