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A synthetic material composed of boron and nitrogen (1:1) that is almost as hard as diamond, used as a superabrasive powder and for cutting and grinding applications.

Related Terms


Any synthetic material used in geotechnical engineering, such as geotextiles and geomembranes.


Contour cutting of material by the action of a reciprocating punch that takes repeated small bites as the work is passed beneath it.


A torch in which temperatures as high as 50,000 C are achieved by injecting a plasma gas tangentially into an electric arc formed between electrodes in a chamber; the resulting vortex of hot gases emerges at very high speed through a hole in the negative electrode, to form a jet for welding, spraying of molten metal, and cutting of hard rock or hard metals.


The set of a diamond in a cutting tool so that the crystal face will be in contact with the material being cut.


  1. The point or edge of a diamond or other material set in a drill bit. Also known as cutting point. 2. The edge of a lathe tool in contact with the work during a machining operation.


The base fluid, usually a refined petroleum fraction or a selected synthetic material, into which additives are blended to produce finished lubricants.


A bit into which inset cutting points of various preshaped pieces of hard metal (usually a sintered tungsten carbidecobalt powder alloy) are brazed or hand-peened into slots or holes cut or drilled into a blank bit. Also known as slug bit.


Hardness of a material as determined by testing with a file of standardized hardness; a material which cannot be cut with the file is considered as hard as or harder than the file.


A thin wheel impregnated with an abrasive used for severing or cutting slots in a material or part.


A sound-recording method in which, for input signals of a given amplitude, the resulting recorded amplitude is inversely proportional to the frequency; the velocity of the cutting stylus is then constant for all input frequencies having that a design plan for material and equipment into a project ready for operation.

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