| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Brinell hardness tester | Mining | A. In heat treating, one who determines the hardness of pieces of metal by the Brinell hardness test. Also called Brinell operator. (references) | |
| Hardness tester | Occupations | 1: Collects samples of coal, ore, crushed stone, aggregate, sand or gravel from railroad cars, conveyors, stockpiles or mines and tests materials for conformance to specifications: Gathers samples from specified locations and transports samples to laboratory. Dumps material into sample divider to reduce volume of sample. Weighs material, using balance scale, and dumps sample into grinding machine to grind and blend sample or into screen testing machine to separate particles by size. Weighs segregated particles collected on each screen and computes percentage of each in total sample. Examines samples for presence of foreign matter and variation from color standard. Compiles reports indicating percentages of materials of specified size. Notifies management when materials do not meet specifications. May weigh, dry, and reweigh samples to determine moisture content of samples. May bag samples for testing at other locations. May perform chemical sedimentation or magnetic separation tests. May perform hardness test on pellets. May plot origin of samples on mine map. (references) | |
| 2: Tends tumble drums, screens, and balance scales to test hardness of baked taconite pellets: Reads schedule to obtain specifications, such as furnace from which pellets are to be drawn and time of withdrawal, and notifies sampling personnel to prepare sample pellets. Pours sample over screen, and weighs screened pellets on balance scale. Dumps pellets into drum, and starts drum rotating for specified number of turns. Screens tumbled pellets, and weighs them to determine weight loss from tumbling. Reads conversion chart to obtain hardness number. Records hardness number of samples tested. May clean work area, using broom, shovel, and water hose. (references) | |||
| Vickers' diamond hardness tester | Mining | A small impression machine, capable of testing very hard metals, finished components, and very thin sheets. The diamond is similar to that used in the diamond pyramid hardness test. The duration of application of the load is controlled automatically, being always applied and removed in exactly the same manner. This machine may also be used with a ball indenter for the Brinell hardness test. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
