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Search Publications by: Jun-Feng Song (Fed)

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Displaying 251 - 275 of 292

Measurement Traceability of NIST Standard Rockwell Diamond Indenters

January 1, 1998
Author(s)
Jun-Feng Song, Samuel R. Low III, Walter S. Liggett Jr, David J. Pitchure, Theodore V. Vorburger
A metrology-based Rockwell hardness scale is established by a standard machine and a standard diamond indenter. Both must be established through force and dimensional metrology with acceptably small measurement uncertainties. In 1994, NIST developed a

NIST Microform Calibration - How It Benefits U.S. Industry

January 1, 1998
Author(s)
Jun-Feng Song, Theodore V. Vorburger
In microform metrology, complex 3-D surface features in the micrometer range must be quantified for their space and size including dimensions, curves, angles, profile deviations, and alignment errors, as well as surface roughness with measure uncertainties

Establishing a Worldwide Unified Rockwell Hardness Scale With Metrology Traceability

January 1, 1997
Author(s)
Jun-Feng Song, Samuel Low, David J. Pitchure, A Germak, S Desogus, T Polzin, H Yang, H Ishida, G Barbato
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

Measurement Comparison of Stylus Radii

January 1, 1997
Author(s)
Jun-Feng Song, Theodore V. Vorburger
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 uncertainty

Stylus-Laser Surface Calibration System

October 1, 1996
Author(s)
Theodore V. Vorburger, Jun-Feng Song, T Giauque, Thomas Brian Renegar, Eric P. Whitenton, M Croarkin
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

Stylus Flight in Surface Profiling

January 1, 1996
Author(s)
Jun-Feng Song, Theodore V. Vorburger
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 stylus

Uncertainty Procedure for NIST Surface Finish and Microform Calibration

January 1, 1996
Author(s)
Jun-Feng Song, Theodore V. Vorburger
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

Stylus Technique for Direct Verification of Rockwell Diamond Indenters

November 23, 1995
Author(s)
Jun-Feng Song, F Rudder, Theodore V. Vorburger, J Smith
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

Microform Calibration Uncertainties of Rockwell Diamond Indenters

September 1, 1995
Author(s)
Jun-Feng Song, F Rudder, Theodore V. Vorburger, J Smith
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 of