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Twist drills

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Parts of a twist drill

Shank

The end of the drill that is held by the machine is called the shank, this can be a straight shaft equal to the diameter of the drill or less then the diameter of the drill. Drills can also have Morse taper shanks, this is more common for drills over 1/2" because it provides additional strength, and because the average chuck can only hold up to a 1/2" shaft.

Drill Shanks

Flutes

The spiraled channels that help chips to escape from the hole being drilled are called flutes. They are manufactured with varying angles to achieve different rates of chip removal. The flutes also have lands that ride on the inside of the hole.

Drill Flute

Chisel point

Lip

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--Athowhen 05:45, 22 September 2007 (UTC)

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