FORCE & HARDNESS
For force measurement, the process of calibration is the comparison of applied forces indicated by a measurement system under test to a calibration standard. The traceability of the standard used defines the resulting range and accuracy of the system being tested
Hardness Calibration should be performed on a periodic basis to verify that the accuracy of the instrument is within the manufacturer’s stated tolerances for the grade or model. As a hardness tester repeatedly measures the relative resistance of materials to denting, bending, or scratching, it can become misaligned. Calibration and adjustment will be required to restore its reliability.
TENSION AND COMPRESSION
DIGITAL TORQUE METER
The first widely used standardized hardness test, the Brinell method determines the indentation hardness of metal materials and is typically used for materials with a coarse surface or a surface too rough to be tested through other methods.
The Brinell test is not useful for fully hardened steel or other hard materials, however, and often leaves a large impression on the metal. The Brinell test is also very slow.
Developed to provide a less destructive alternative to the Brinell test, this differential-depth method eliminates the errors associated with mechanical imperfections.
Quicker and cheaper than the Brinell and Vickers tests, the Rockwell test requires no material prep, and hardness value is easily readable without any extra equipment, making this one of the most commonly used methods of measuring metal hardness.
Making use of a diamond indenter, the Vickers hardness test is done with less force and more accuracy than the Brinell test. By magnifying the surface of a metal, this test can target specific microstructural constituents like martensite or bainite, or assess the quality of heat treating or surface hardening operations.
Requiring an optical system and material prep, the Vickers test incurs higher costs and takes longer to complete than the Rockwell test.