drag bit

drag bit

[′drag ‚bit]
(design engineering)
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References in periodicals archive ?
Today, polycrystalline diamond compact (PDC) is the most commonly used drag bit with PDC, diamond impregnated, or diamond hybrid cutters mounted on the bit blades/body.
A mediocre drag bit and two salacious women in sombreros and black patent slickers are particularly unnecessary.
A drag bit crushes the rock ahead of it, and this forms a plastic zone around the cutting edge.
Since their introduction a decade earlier, ChrisDril bits have achieved rapid penetration rates: using disc-shaped cutters, they combine the cutting efficiency of a drag bit with the long-life economy of polycrystalline diamonds.
Established in 1988, Bit Brokers offers a wide selection tricones, tricone cutters, vertical and HDD hole openers/reamers, PDC bits, PDC and tricone reamers, hammers, hammer bits and drag bits.
So there are plenty of drag bits, fat suits and gay jokes, such as Walliams' fey British prime minister acting like he has a positively giddy crush on the U.
Cutterheads for mixed ground feature ripper teeth, drag bits, or cutters with two rows of tungsten carbide bits.
Generally, they allow you to drag bits (called loops) of self-contained music sampled from various instruments onto a grid that functions as the program's tablature.
Tungsten-carbide drag bits, lower cutters on the cutter wheel, a short conical shield skin, high thrust force, and the possibility to umbrella grout and rock bolt through the shield skin all contribute to the ability to cope with the variety of ground conditions.
Black Dragon is also exploring the use of blade type drag bits for deeper drilling as well as downhole motor drilling technology.
Microtunneling machines (MTBMs) are often the first-choice for longer bore lengths; however, most MTBMs use tungsten carbide drag bits on the cutting head, which are highly inefficient in hard rock.
There are almost twice as many numbers (39, mostly disco), with all but those laid over the various drag bits performed in full voice, and the stage is awash with jaw-dropping costumes.