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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.

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.