Unlike conventional light-based microscopes, electron microscopes use a beam of electrons to image a specimen. Because electrons are much smaller (~2.8 femtometers) than the wavelength of visible-light photons (400-800 nanometers), they are capable of producing much higher-resolution images.
Here a piece of steel is being cut by a titanium-coated carbide blade with a tip radius of approximately 200µm. As the piece of steel is pressed against the blade the rough upper layer is sheared away to produce a smooth surface.
Source: https://youtu.be/mRuSYQ5Npek
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