ball hardness

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• hardness tester — ▪ device       device that indicates the hardness of a material, usually by measuring the effect on its surface of a localized penetration by a standardized rounded or pointed indenter of diamond, carbide, or hard steel.       Brinell hardness is …   Universalium

• Ball bearing — For individual balls that are sometimes called ball bearings , see Ball (bearing). Working principle for a ball bearing …   Wikipedia

• Bowling ball — A bowling ball is a round ball made from, urethane, plastic, reactive resin or a combination of these materials which is used in the sport of bowling. Ten pin bowling balls generally have a set of three holes drilled in them, one each for the… …   Wikipedia

• Brinell hardness — (HB or BHN)    a measure of the hardness of a metal introduced by J. A. Brinell in 1900.    In the Brinell test (generally used for metals of uniform hardness), a hard object such as a steel ball is pressed into the material being tested. The… …   Dictionary of units of measurement

• Vickers hardness test — A Vickers hardness tester The Vickers hardness test was developed in 1924 by Smith and Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials.[1] The Vickers test is often easier to use than other… …   Wikipedia

• Janka hardness test — hi The Janka hardness test measures the hardness of wood. It involves measuring the force required to embed a 11.28 millimeter (0.444 inch) steel ball into wood to half its diameter. This method was chosen so that the result would leave an… …   Wikipedia

• Rockwell hardness — (RH )    a measure of the hardness of a metal introduced by Rockwell in 1922. In a Rockwell hardness test, a penetrator makes an indentation in the metal under two constant loads, a minor load (generally 10 kilograms) and then a major load. The… …   Dictionary of units of measurement

• Billiard ball — Cueball redirects here. For the video game, see Jimmy White s 2: Cueball. Cue balls from (left to right): Russian pool and kaisa 68 mm (2 11⁄16 …   Wikipedia

• Cricket ball — Cricket portal …   Wikipedia

• Brinell hardness — Bri·nell hardness brə .nel n the hardness of a metal or alloy measured by hydraulically pressing a hard ball under a standard load into the specimen Brinell Johan August (1849 1925) Swedish engineer. After studying the internal composition of… …   Medical dictionary

• Bri|nell hardness — «brih NEHL», the relative hardness of a metal, determined by pressing a steel ball under a given pressure into the substance under test. ╂[< J. A. Brinell, 1849 1925, Swedish engineer, who devised the test for it] …   Useful english dictionary