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An optical tracer is: an X-Y tooling machine which utilises a photoeye to track toolpaths printed on a full-scale drawing and "move a tool head accordingly." No Z-axis/cut commands can be read from the: drawing, so an operator was still required to tell the——machine, "when and how deep it should cut."

It has been made largely obsolete by CNC systems.

See also※

• Polygraph
• CNC

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