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You searched on: Author: jun-feng song

Displaying records 111 to 120 of 130 records.
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111. Establishing a Worldwide Unified Rockwell Hardness Scale With Metrology Traceability
Published: 1/1/1997
Authors: Jun-Feng Song, Samuel Rea Low III, David J Pitchure, A Germak, S Desogus, T Polzin, H Yang, H Ishida, G Barbato
Abstract: Recently developed microform measurement techniques have reduced the measurement uncertainties in the geometry of Rockwell diamond indenters. It is now possible to establish standard grade Rockwell diamond indenters characterized by high geometry un ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820876

112. Measurement Comparison of Stylus Radii
Published: 1/1/1997
Authors: Jun-Feng Song, Theodore Vincent Vorburger
Abstract: Three methods were used for measuring the radii of the same stylus of our stylus instrument. The measurement results were compared and showed good agreement. Using razor blade tracing, the stylus radius was measured as r=1.60um with an expanded uncer ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820877

113. The Guidelines for Expressing Measurement Uncertainties and the 4:1 Test Uncertainty Ratio
Published: 1/1/1997
Author: Jun-Feng Song
Abstract: In 1988, MIL-STD-45662A adopted the 4:1 Test Uncertainty Ratio (TUR); this was later incorporated into the ANSI/NCSL Z540-1 standard in 1994. However, in 1992, the National Institute of Standards and Technology (NIST) began to adopt a new method for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820875

114. Stylus-Laser Surface Calibration System
Published: 10/1/1996
Authors: Theodore Vincent Vorburger, Jun-Feng Song, T Giauque, Thomas B Renegar, Eric Paul Whitenton, M Croarkin
Abstract: A stylus-laser surface calibration system was developed to calibrate the NIST sinusoidal roughness Standard Reference Materials (SRM) 2071-2075. Step height standards are used to calibrate the stylus instrument in the vertical direction, and a laser ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820830

115. Standard Grade Rockwell Diamond Indenters - A Key to a Worldwide Unified Rockwell Hardness Scale
Published: 1/1/1996
Authors: Jun-Feng Song, Samuel Rea Low III, David J Pitchure, Theodore Vincent Vorburger
Abstract: Since the 1980's, the European Community (EC) has established a unified Rockwell C hardness (HRC) scale by averaging several national scales, which come from each country''s national hardness machines and diamond indenters. These indenter ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820820

116. Standard Grade Rockwell Diamond Indenters - A Key to a Worldwide Unified Rockwell Hardness Scale (in Japanese)
Published: 1/1/1996
Authors: Jun-Feng Song, Theodore Vincent Vorburger
Abstract: Since the 1980''s, the European Community (EC) has established a unified Rockwell C hardness (HRC) scale by averaging several national scales, which come from each country''s national hardness machines and diamond indenters. These ind ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820997

117. Stylus Flight in Surface Profiling
Published: 1/1/1996
Authors: Jun-Feng Song, Theodore Vincent Vorburger
Abstract: In this paper, theoretical and experimental work on stylus flight is described. Experiments on the surfaces of different roughness specimens with sinusoidal, rectangular, triangular and random waveforms support the theoretical model, which predicts s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820821

118. Uncertainty Procedure for NIST Surface Finish and Microform Calibration
Published: 1/1/1996
Authors: Jun-Feng Song, Theodore Vincent Vorburger
Abstract: An uncertainty procedure is used for reporting the NIST surface finish and microform calibration uncertainties. The combined standard uncertainty is a combination of the uncertainty from the geometric non-uniformity of the measured surface, and the u ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820822

119. Stylus Technique for Direct Verification of Rockwell Diamond Indenters
Published: 11/23/1995
Authors: Jun-Feng Song, F Rudder, Theodore Vincent Vorburger, J Smith
Abstract: Based on a stylus technique, a microform calibration system was developed at NIST for the direct verification of Rockwell diamond indenters. The least-squares radius and profile deviations, cone angle and cone flank straightness, and the holder axis ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820771

120. Microform Calibration Uncertainties of Rockwell Diamond Indenters
Published: 9/1/1995
Authors: Jun-Feng Song, F Rudder, Theodore Vincent Vorburger, J Smith
Abstract: National and international comparisons in Rockwell hardness tests show significant differences. Uncertainties in the geometry of the Rockwell diamond indenters are largely responsible for these differences. By using a stylus instrument, with a series ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820770



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