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Dressing out a drill bit

Drillers always have a minimum of two drills bits on the go, so while one is engaged in drilling the other can be dressed out.

At the forge they heat the bit and shape it out to the width of the hole. Not only is it important to know how to correctly shape the bit to drill through different types of rock, but it is also necessary to temper the steel so it isn’t so hard it will break or so soft it will drill the hole bigger at the bottom than at the top. The steel is tempered by heating it below its 2,500 degrees melting point, then cooling it to increase its strength and hardness.

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