four-ball tester

[¦fȯr ¦bȯl ′tes·tər]

(engineering)

A machine designed to measure the efficiency of lubricants by driving one ball against three stationary balls clamped together in a cup filled with the lubricant; performance is evaluated by measuring wear-scar diameters on the stationary balls.

References in periodicals archive ?

The test oils are tested for improvement in tribological properties on a four-ball tester. The weight percentage of surface-modified and ball-milled MWCNTs is maintained as 0.5 wt %.

In this test on four-ball tester a series of 10 tests of 10-second duration are carried with varying load under the following conditions:

Effect of Size of Multiwalled Carbon Nanotubes Dispersed in Gear Oils for Improvement of Tribological Properties

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Fouquet, Nicolas
Fouquier-Tinville
Fouquier-Tinville, Antoine Quentin
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