Why is coolant used when cutting metal?

To reduce friction and heat at the cutter.

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  1. To add color to the part
  2. To reduce friction and heat at the cutter ✔
  3. To make the metal rust

Why: Coolant lowers friction and temperature at the cutting interface, preventing excessive tool wear.

Huh, didn't know that: Coolant lowers friction and temperature at the cutting interface, preventing excessive tool wear.

The dad joke
Coolant keeps the cutter from losing its cool.
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References

Answer: To reduce friction and heat at the cutter. Coolant lowers friction and temperature at the cutting interface, preventing excessive tool wear.

  1. Metalworking en.wikipedia.org/wiki/Metalworking
    Coolant is generally introduced by a spray across the face of the tool and workpiece to decrease friction and temperature
    Checked 2026-11-07.

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