MITSUBISHI MATERIALS CORPORATION
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FUNCTION OF TOOL FEATURES FOR TURNING

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
Rake Angle and Tool Life,Effects of Rake Angle on Cutting Speed, Vertical Force, and Cutting Temperature

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.