Drill bit
Drill bit
A drill bit is a cutting tool used in drilling machines to create cylindrical holes. The drill bit is pressed against the workpiece and rotated at rates from hundreds to thousands of revolutions per minute. This forces the cutting edge against the workpiece, cutting off chips (swarf) from the hole as it is drilled.
Pronunciation
/dri:l bɪt/
Etymology
The term "drill bit" is derived from the Old English 'drillen' meaning 'to bore or drill' and the Middle English 'biten' meaning 'to bite or cut into'.
Types of Drill Bits
There are several types of drill bits, each designed for specific uses. Some of the most common types include:
- Twist drill bit: The most common type of drill bit, used for everyday drilling in metal.
- Step drill bit: A bit with a stepped design, used for drilling in thin materials.
- Masonry bit: A bit designed for drilling into masonry or concrete.
- Forstner bit: A bit used for drilling precise, flat-bottomed holes in wood.
- Spade bit: A bit with a broad, flat blade for drilling larger holes in wood.
Related Terms
- Drilling machine: A machine for making holes or tunnels.
- Workpiece: The item being worked on.
- Swarf: The waste material produced when drilling a hole.
External links
- Medical encyclopedia article on Drill bit
- Wikipedia's article - Drill bit
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