The second tool is for calculating the elastic compression of spheres and cylinders at point and line contact, which can enable the user, for example, to correct for elastic deformations when measuring a part with a contacting probe. The first tool is for calculating the index of refraction of air, which is needed for interferometric length measurements. ![]() We hope you will find it to be a useful aid that improves your measurement capabilities.Ĭurrently the web site has two computational tools. ![]() This web site is one of an array of mechanisms we make available to our customers to help them achieve high-accuracy dimensional measurements traceable to national and international standards. Our goal is to provide world-class engineering metrology resources to the U.S. The Engineering Metrology Toolbox is your web site for computational tools that solve real problems in dimensional measurement. ![]() 10010 - Short Blocks by Mechanical Comparison 10012 - Long Gage Blocks by Mechanical Comparison 10020 - Length Scale Measurement Procedures at the National Bureau of Standards 10060 - Sieve Calibration 11010 - Thread Wires and Cylinders by Mechanical Comparison 11030 - Balls by Mechanical Comparison 11033 - Ball Diameter by Interferometry 13010 - Optical Flat Calibration by Comparison 13020 - Roundness Standards using the Multi-Position Method 14010 - Angle Blocks by Comparison 14011 - 30 and 45 Degree Angle Blocks by Circle Closure 14020 - Polygon Calibration 14030 - Indexing Tables by Subdivision 14510 - Laser Frequency Calibration 15010 - Roughness Calibrations and Measurements 15030 - Large Step Height Calibrations and Measurements 15030 - Small Step Height Calibrations and Measurements Interferometric Calibration of Sphere Diameter
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