Glossary

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V-block

Workholding device with V-shaped slot for holding pipe and other round stock during machining or inspection.

vertical milling attachment

Permits a horizontal mill to perform vertical and angled milling.

vibratory bowl feeder

Hopper/conveyor mechanism utilizing a vibratory motion in conjunction with a spring suspension system designed to deliver parts to an assembly machine at a specified rate and with proper part orientation.

Vickers hardness number (HV)

Number related to the applied load and surface area of the permanent impression made by a square-based pyramidal diamond indenter having included face angles of 136º. The Vickers hardness number is a ratio of the applied load in kgf, multiplied by 1.8544, and divided by the length of diagonal squared.

Vickers hardness test

Indentation hardness test employing a 136° diamond pyramid indenter (Vickers) and variable loads enabling the use of one hardness scale for all ranges of hardness from very soft lead to tungsten carbide. The result is expressed as Vickers hardness number. See Brinell hardness test; Knoop hardness test; Rockwell standard hardness test; Rockwell superficial hardness test; Scleroscope hardness test.

viscosity

Measure of a fluid’s tendency to flow; varies with temperature.

vise

Workholding device that mounts on various machining tables. Designs vary from plain to flanged to swiveling. Multiangle vises, such as the toolmaker’s universal vise, accurately hold work to allow machining at virtually any angle.

vision system

System in which information is extracted from visual sensors to allow machines to react to changes in the manufacturing process.