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SESK: Stuff Everyone Should Know · sesk.info/eng-cnc-programmed-motion

What does computer numerical control do in a machine tool?

CNC uses a program to direct the machine's tool motions.

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  1. It automatically designs the part
  2. It directs tool motion from programmed instructions ✔
  3. The operator steers the tool by hand

Why: A CNC program commands positions, paths, speeds, and related actions. The machine repeats those instructions accurately, but setup, tooling, and verification still require engineering judgment.

Huh, didn't know that: Common CNC machines include mills, lathes, routers, grinders, and electrical discharge machines.

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The CNC machine followed directions to the letter, G-code included.
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References

Answer: It directs tool motion from programmed instructions. A CNC program commands positions, paths, speeds, and related actions. The machine repeats those instructions accurately, but setup, tooling, and verification still require engineering judgment.

  1. University of Alaska Fairbanks Makerspace: Desktop CNC www.uaf.edu/makerspace/processes/desktop-cnc/index.php
    CNC (computer numerical control) machining is a process where programmed computer software directs the motions of a tool.
    Checked 2026-10-10.

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