Tricone drilling bit

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Here is a close-up view of a rotating tricone drilling bit.

Observe that each of the cones rotate independently of the other. Lets take the example of a fan, each of the blades of a fan rotate together in one direction.

But each of the cone of a tricone bit rotate in different directions and with different speeds. Cone 1 is slightly faster than cone 2 and cone 2 is slightly faster than cone 3.