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What (who) is drilled$544308$ - definition

CUTTING PROCESS THAT USES A DRILL BIT TO CUT A HOLE OF CIRCULAR CROSS-SECTION IN SOLID MATERIALS

Hot water drill; Drilling and threading; Trepanning (manufacturing); Peck drilling; Trepanning (drilling); Drilled

Teufe

DEPTH OF A BOREHOLE OR MINE SHAFT RELATED TO THE SURFACE

Depth (mining)

Teufe is the German mining term for depth. The Teufe (hT) indicates how deep a given point lies below the surface of an open-cast pit or below the ground level in the area surrounding the pit. By contrast, the height, h, refers to its distance from a reference surface 'above'. The vertical distance between the surface and a point in the mine (Grubengebäude), i.e. the vertical depth, was formerly also called the Seigerteufe. This difference is no longer made today. The terms Teufe and Seigerteufe are synonymous.

https://en.wikipedia.org/wiki/Teufe

drilling

see drill

Drilling

·noun The act of piercing with a drill.

II. Drilling ·noun A training by repeated exercises.

III. Drilling ·noun The act of using a drill in sowing seeds.

IV. Drilling ·noun A heavy, twilled fabric of linen or cotton.

V. Drilling ·p.pr. & ·vb.n. of Drill.

Wikipedia

Drilling

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.

https://en.wikipedia.org/wiki/Drilling