Drill bits are cutting tools used to create cylindrical holes. Bits are clamped to a tool called drill, which rotates them and provide torque and axial force to create the hole.
The outward apperarance of the standard twist drill has not changed during the pst 50 years. Basically it consits of a shank for mounting into the drilling machine, helical flutes that form rake angles and permit the escape of chips, and two cutting edges seperated by a chisel edge.
Twist drills are end cutting tools with one or more cutting edges having helical or straight flutes or grooves adjajcent for the admission of the coolant and the ejection of cutting or chips.
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