MITSUBISHI MATERIALS CORPORATION
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FUNCTION OF TOOL FEATURES FOR TURNING

RAKE ANGLE
Rake angle is a cutting edge angle that has a large effect 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 the cutting edge strength is required such as for uncut surfaces and interrupted cutting.
When to Increase Rake Angle in the Positive (+) Direction
  • Soft workpiece.
  • Workpiece is easily machined.
  • When the workpiece or the machine have poor rigidity.
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