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The Maker's Manual by Patrick Di Justo, Andrea Maietta, Paolo Aliverti

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Chapter 13. Milling

Michelangelo, artist and master of subtractive techniques, used to say that what he did was to free his works from the marble that kept them trapped. Today, thanks to machines, we can also free “objects” trapped in foam blocks, resin, or wood, without necessarily becoming artists of the chisel. These machines, which make our objects rise from an ocean of burrs, are called computer numerical control (CNC) machines—that is, machines that can control other tools (such as mills, lathes, grinders, and drills) via computer.

CNC Machines

Just like 3D printers, CNC machines are nothing new: they have been used for decades to manufacture precision mechanical parts. These machines are often very large and expensive, made of cast iron ...

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