twist drill bits point characteristics

Conventional point(118 degree) twist dril bits

Performance benefit:

1: General purpos

2: Widely available

3: Acceptable drill lift

4: Best suited in mild steel and aluminium

1: Not self-centering   "walking" can occur on hard surface

2: May produce burrs on breakthrough

Split-point (118 degree and 135 degree) twist drill bits

Performance benefit:

1: Selft centering when drill with the drill bits

2: Excellent for portable drilling

3: Longer drill life for the drill bits

4: Good for drilling on curved surfaces

5: Improved penetration rates

6: Requires less effort

7: Breaks up chips

8: Best suited in alloy steels

1: Difficult regrind

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