Indentation hardness test, performed with either 3 gf or 9 gf loads, preceded the development of microhardness testers using traditional indenters. In 1925, Smith and Sandland of the UK developed an indentation test that employed a square-based pyramidal indenter made from diamond. They chose the pyramidal shape with an angle of 136° between opposite faces in order to obtain hardness numbers that would be as close as possible to Brinell hardness numbers for the specimen. The Vickers test has a great advantage of using one hardness scale to test all materials.The first reference to the Vickers indenter with low loads was made
Ichalkaranji are used in engineering and other manufacturing industries, engineering institutes and research institutes for analysis. These measuring instruments are marketed in India as well as some other countries. Measuring instruments manufactured in city by varies companies include compression testing machines, torsion testing machines, horizontal chain and rope testing machines, spring testing machine, impact testing machine, Erichsen testing machines, universal testing machines, Rockwell scale hardness tester, Brinell scale hardness tester, and computerised Vickers hardness test. The city's economy. driven by the engineering goods manufacturing industry (which has been around since the 1950s). Several automotive component manufacturers have plant's in or around