MITSUBISHI MATERIALS CORPORATION
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RAKE ANGLE
Rake angle is a cutting edge angle that has large effects on cutting resistance, chip disposal, cutting temperature, and tool life.
Chip Disposal and Rake Angle
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  • Effects of Rake Angle
  1. Increasing rake angle in the positive (+) direction improves sharpness.
  2. Increasing rake angle by 1° in the positive (+) direction decreases cutting power by about 1%.
  3. Increasing rake angle in the positive (+) direction lowers cutting edge strength and in the negative (-) direction increases cutting resistance.
When to Increase Rake Angle
in the Negative (-) Direction
  • Hard workpiece.
  • When cutting edge strength is required such as in interrupted cutting and uncut surface cutting.
When to Increase Rake Angle
in the Positive (+) Direction
  • Soft workpiece.
  • Workpiece is easily machined.
  • When workpiece or the machine have poor rigidity.