Flutes are the sharp slots that corkscrew upwards along the length of a milling bit. They are responsible for doing the cutting work when the bit is spinning.

2 Flutes 3 Flutes 4 Flutes
  • Big chip space
  • Easy chip ejection
  • Good for slot milling
  • Good for heavy duty milling
  • Less rigidity due to small section area
  • Lower surface finish
  • Chip space almost as big as 2 flutes
  • Bigger section area - higher rigidity than 2 flutes
  • Improved surface finish
  • Highest rigidity
  • Biggest section area - small chip space
  • Gives highest surface finish
  • Recommended for profiling, side milling and shallow slotting

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