Working of Brinell Hardness Testing Machine

Working of Brinell Hardness Testing Machine Points : Working of Brinell Hardness Testing Machine The harness test is carried out as follows: The test piece is placed on the top of the elevating screw and the screw is raj screw moves up, electric connections take place and the reflector throws the light on of the test piece.
A sharp view of the steel, showing the surface qualitative then app ground-glass screen. Now with dash pot set at the correct rate of loading the load leave nearly 300, from which position it automatically moves further till it stops. During indenter moves to the position of the test piece and makes indentation/impression. To pulled back to its original position after about 15 seconds. Simultaneously the objective comes to its normal position over the specimen and thus, the indentation duly 70 times is taken on the screen. The left hand corner of the impression taken on the coincided to convenient scale graduating by knurled thumb screw and right hand corner micrometer screw and the reading taken off.
The Brinell hardness number is to some extent an indication of the tensile stress metal, which may be ascertained by multiplying the Brinell number by a constant which on the character of the metal or alloy.