boring head
Single- or multiple-point precision tool used to bring an existing hole within dimensional tolerance. The head attaches to a standard toolh…
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Glossary Terms
boring machine
Similar to a turning machine except that the cutting tool (single-point or multiple-cutting-edge), rather than the workpiece, rotates to pe…
boundary additives
Sulfur, chlorine, phosphorus and other compounds added to cutting fluids to fill in surface irregularities at the tool/workpiece interface,…
Brinell hardness number (HB)
Number related to the applied load (usually, 500 kgf and 3,000 kgf) and to the surface area of the permanent impression made by a 10mm ball…
Brinell hardness test
Test for determining the hardness of a material by forcing a hardened steel or carbide ball of specified diameter into the material under a…
brittle fracture
Separation of a solid accompanied by little or no macroscopic plastic deformation. Typically, brittle fracture occurs by rapid crack propag…
broach
Tapered tool, with a series of teeth of increasing length, that is pushed or pulled into a workpiece, successively removing small amounts o…
broaching
Operation in which a cutter progressively enlarges a slot or hole or shapes a workpiece exterior. Low teeth start the cut, intermediate tee…
broaching machine
Machine designed specifically to run broaching tools. It is typically designated by operating characteristics (pull, push, rotary, continuo…
brushing
Generic term for a curve whose shape is controlled by a combination of its control points and knots (parameter values). The placement of th…
B-spline
Smoothing and shining a surface by pressing an abrasive compound, embedded in a soft wheel or belt, against the workpiece.
built-up edge (BUE)
1. Permanently damaging a metal by heating to cause either incipient melting or intergranular oxidation. 2. In grinding, getting the workpi…