NEW NIST PRACTICE GUIDE ON ROCKWELL HARDNESS TESTING AVAILABLE.The NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. Recommended Practice Guide: Rockwell Hardness Measurement of Metallic Materials (NIST Special Publication 960-5)--the latest in the new practice guide publication series--is now available. Rockwell is a method-based test primarily used by metals and metal products producers to measure the hardness of metal parts, such as those found in aircraft and automobiles. The new guide is aimed at promoting accuracy and consistency in test results in the laboratory and on the production floor. Offering good practice recommendations, the guide highlights the causes of variability in test results. To help machine operators avoid errors, the guide covers common problems, such as using the correct Rockwell scale, surface preparation, speed of testing, machine verification and environmental factors. As part of its Rockwell hardness standardization program, NIST has developed standard reference material (SRM (1) (Storage Resource Management) The management of the storage resources in an organization in order to avoid duplication of files and to determine space utilization across all servers. ) test blocks for the Rockwell C scale, which is used for hard metals, primarily steel. The SRMs are used to calibrate To adjust or bring into balance. Scanners, CRTs and similar peripherals may require periodic adjustment. Unlike digital devices, the electronic components within these analog devices may change from their original specification. See color calibration and tweak. commercial hardness machines. Researchers are working on SRMs for the B scale softer metals, such as aluminum, bronze, copper and brass. NIST also is involved with the American Society for Testing and Materials, the International Standards Organization See ISO. and the International Committee of Weights and Measures weights and measures, units and standards for expressing the amount of some quantity, such as length, capacity, or weight; the science of measurement standards and methods is known as metrology. in developing an international reference standard. Responding to a related industry problem, NIST has established a microform In micrographics, a medium that contains microminiaturized images such as microfiche and microfilm. See micrographics. calibration system for measuring the geometry of diamond indenters with high accuracy. To obtain a copy of NIST SP 960-5, contact Public Inquiries, (301) 975-NIST (6478), inquiries@nist.gov. |
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