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alignment of drilling bit with hole already drilled - translation to russian
![cross slide]].](https://commons.wikimedia.org/wiki/Special:FilePath/Trepanned hole in steel plate.jpg?width=200 "cross slide]].")
нефтегазовая промышленность
центрирование бурового долота относительно пробуренной части ствола скважины
Definition
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Wikipedia
Drilling is a cutting process where a drill bit is spun to cut a hole of circular cross-section in solid materials. The drill bit is usually a rotary cutting tool, often multi-point. The bit is pressed against the work-piece and rotated at rates from hundreds to thousands of revolutions per minute. This forces the cutting edge against the work-piece, cutting off chips (swarf) from the hole as it is drilled.
In rock drilling, the hole is usually not made through a circular cutting motion, though the bit is usually rotated. Instead, the hole is usually made by hammering a drill bit into the hole with quickly repeated short movements. The hammering action can be performed from outside the hole (top-hammer drill) or within the hole (down-the-hole drill, DTH). Drills used for horizontal drilling are called drifter drills.
In rare cases, specially-shaped bits are used to cut holes of non-circular cross-section; a square cross-section is possible.
