00:00These tiny drill bits are the steel teeth that crush rocks miles underground.
00:04Inside each cone, special grease protects the bearings from brutal heat and pressure.
00:08Once the steel ball bearings are in place, the cones spin like living creatures.
00:12But why do almost all rock drilling bits look like this?
00:15Because they don't just spin, they crush, chip, and grind from three angles at once.
00:19Each cone cuts at a slightly different angle, reducing vibration and wear,
00:22while cross-rotation clears crushed rock like a built-in escape path.
00:26The tungsten carbide tips are shaped sharp or rounded, depending on the rock.
00:30After a century of evolution, this form remains the perfect design for drilling through the earth.
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