Operations that create or widen/improve round holes
Hole processing methods are, for example:
- Twist drilling
- Coarse and fine boring
Chip-breaking operation when an existing hole diameter is increased by a rotary cutter.
Abrasive machining where a tool consisting of a number of abrasive stones is scrubbed along the inner wall of a hole
Reamers are used to widen a hole diameter while improving its roundness.
The twist drill is the most common tool used for creating a hole.