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drilling

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drilling

Common woodworking and metal machinery process that involves boring holes with a drill bit. The commonest kind of drill bit is the fluted drill, which has spiral grooves around it to allow the cut material to escape. In the oil industry, rotary drilling is used to bore oil wells. The drill bit usually consists of a number of toothed cutting wheels, which grind their way through the rock as the drill pipe is turned, and mud is pumped through the pipe to lubricate the bit and flush the ground-up rock to the surface.

In rotary drilling, a drill bit is fixed to the end of a length of drill pipe and rotated by a turning mechanism, the rotary table. More lengths of pipe are added as the hole deepens. The long drill pipes are handled by lifting gear in a steel tower or derrick.



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? Mentioned in ? References in classic literature
 
It will be well to move a little off the road and put in the whole day drilling you, sire.
A Connecticut Yankee by Twain, Mark View in context
What with recruiting and drilling of soldiers, there was now nothing but warlike bustle in the streets of Boston.
Grandfather's Chair by Hawthorne, Nathaniel View in context
Then came Eulalie, the proud beauty, the Juno of the school, whom six long years of drilling in the simple grammar of the English language had compelled, despite the stiff phlegm of her intellect, to acquire a mechanical acquaintance with most of its rules.
The Professor by Bronte, Charlotte View in context
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