Rockwell hardness testers

<body> <h1>Rockwell hardness testers</h1> <p>ERNST is a company with over 50 years’ experience in the research, design and production of high quality hardness testers. Active in the international market with an extensive range of hardness testers, it gathers information and requests from a demanding and diversified market, in order to continue to be at the forefront of the production of machines for controlling, measuring and testing materials. ERNST patents are the story and the future of the company, a company that is constantly researching new technological solutions to the still unsolved problems in metal hardness testing. The range of ERNST hardness testers includes: - light and heavy load portable hardness testers, suitable for testing large specimens, irregular shapes, and awkward test points that bench testers cannot reach - bench hardness testers for Rockwell and Brinell testing with direct reading in many other hardness scales - automatic hardness testers for high volume testing and completely in-line testing operations. All ERNST hardness testers operate according to a variant of the Rockwell method that permits accurate and reliable results also in the presence of deflection of the test part. The series ESATEST hardness testers is based on a new testing method based on the measurement of the electrical resistivity and patented by ERNST. This method allows determining in a rapid way the material hardness in awkward test points, such as interiors, irregular shapes, gear evolvents. The experience and the specialisation, the possibility to offer customized solutions, the extensive range of hardness testers make ERNST a worldwide leader in the production of testing instruments. </p>Rockwell hardness testers The Rockwell hardness test can be divided into two groups: Rockwell and Superficial Rockwell. The difference is given by the test loads, which for the Rockwell test are heavier than for the Superficial Rockwell test. The ERNST Rockwell hardness testers are designed to take the advantages from the Rockwell test, such as the employ of diamond indenters for testing tempered steel or hard metals, and the ball penetrators for soft metals. The Rockwell method allows testing of plastic even under load. The ERNST Rockwell hardness testers allow overcoming some limitations of the Rockwell method. The main disadvantage of the traditional Rockwell hardness testers is that the accuracy of testing depends to a large degree on the perfect contact between the work piece and its support, usually called the anvil. In the presence of oil coat, some grease or other between the test part and the anvil, a little movement occurs during load application, when added to the indentation depth, gives a wrong result, decreasing the hardness value. Because it is not always possible to work in perfect conditions, for example in heat treatment or workshop environments, this is an important consideration. To overcome this problem, almost our hardness testers (AT-series, TWIN, BRE-AUT, COMPUTEST SC, DYNATEST SC) work according to a modification to the Rockwell principle. In this case, a support on the test surface gives the penetration depth. Therefore, any movement of the part, elevating screw or stand, does not influence the test result. Thanks to this method, the same advantages of the Brinell and Vickers principle are reached. The ERNST bench hardness testers have a third important component, called clamping shield. The clamping shield is used for locking of the test piece, avoiding the use of any special support; the clamping shield can be easily removed if needed. In portable hardness testers, this component is called base, it is interchangeable and helps creating a perfect support on the test piece. </body>