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Search Publications by: M Alkan Donmez (Fed)

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Displaying 26 - 50 of 63

Thermographic and FE Simulation of the DMLS Process at NIST

February 4, 2015
Author(s)
Brandon M. Lane, Li Ma, Shawn P. Moylan, M A. Donmez, Eric P. Whitenton, Daniel J. Falvey
A major effort of the Measurement Science for Additive Manufacturing Program at NIST is to provide high quality, well-defined temperature measurement of the DMLS process to support and validate multi-physics simulations. However, the dynamic, complex

An Additive Manufacturing Test Artifact

October 23, 2014
Author(s)
Shawn P. Moylan, John A. Slotwinski, A L. Cooke, Kevin K. Jurrens, M A. Donmez
We propose a test artifact, intended for standardization, for the purpose of evaluating the performance of additive manufacturing (AM) systems. A thorough analysis of previously proposed AM test artifacts as well as experience with machining test artifacts

Standards Related to Prognostics and Health Management (PHM) for Manufacturing

July 7, 2014
Author(s)
Gregory W. Vogl, Brian A. Weiss, M A. Donmez
Prognostics and health management (PHM) systems are utilized to reduce burdensome maintenance tasks of monitored products or processes through diagnostics and prognostics, which provide actionable information that support decision-making for improved

Powder Bed Fusion Machine Performance Testing

April 16, 2014
Author(s)
Shawn P. Moylan, Joseph Drescher, M A. Donmez
Unlike conventional machining where there is a near 1:1 correspondence of machine performance to the geometry of the workpiece, the accuracy of the machine components is only one of the contributors to the quality of a finished AM part. Rather, there is

Lessons Learned in Establishing the NIST Metal Additive Manufacturing Laboratory

June 21, 2013
Author(s)
Shawn P. Moylan, John A. Slotwinski, April Cooke, Kevin K. Jurrens, M A. Donmez
This publication presents a summary of lessons learned by NIST staff during establishment of the NIST Metal Additive Manufacturing Laboratory and implementation of the metal additive manufacturing capability at NIST. These lessons learned resulted from the

A VIRTUAL MACHINE TOOL FOR THE EVALUATION OF STANDARDIZED 5-AXIS PERFORMANCE TESTS

October 26, 2012
Author(s)
Ronnie R. Fesperman Jr., Shawn P. Moylan, M A. Donmez
Standards committees are actively working to develop standard test methods for the performance evaluation of 5-axis machining centers through the direct and indirect measurement of simultaneous motions of all five axes [1-2]. However, the compound effect

Proposal for a standardized test artifact for additive manufacturing machines and processes

August 15, 2012
Author(s)
Shawn P. Moylan, John A. Slotwinski, April L. Cooke, Kevin K. Jurrens, M A. Donmez
Historically, standardized test parts are used to quantitatively evaluate the performance of a machine or process. While several different additive manufacturing (AM) test parts have been developed in the past, there are no current standard test parts. We

A Review of Test Artifacts for Additive Manufacturing

May 24, 2012
Author(s)
Shawn P. Moylan, April L. Cooke, Kevin K. Jurrens, John A. Slotwinski, M A. Donmez
A standardized test part can be used to quantitatively evaluate the performance of a machine or process. This document reviews existing test artifacts used to characterize additive processes that are reported in the literature. Several aspects of the test

Evaluation of Proposed Test Artifacts for Five-Axis Machine Tools

November 18, 2011
Author(s)
Shawn P. Moylan, David Blumenfeld, Michael L. McGlauflin, Ronnie R. Fesperman Jr., M A. Donmez
Machining of a test artifact is an attractive method of evaluating the performance of a machine tool because the tests are often quick and do not require special instrumentation. An appropriate artifact should be complex enough to assess a machine's

Ultra-Precision Linear Motion Metrology

June 23, 2010
Author(s)
Ronnie R. Fesperman Jr., M A. Donmez, Shawn P. Moylan
Many new emerging applications of nanotechnologies require the use of compact precision linear translation stages that have positioning resolution on the order of a nanometer and an exceptionally long range of motion on the order of tens of millimeters

Impact of automation on precision

August 3, 2009
Author(s)
M A. Donmez, Johannes A. Soons
Automation has significant impacts on the economy and the development and use of technology. In this section, the impacts of automation on precision, which directly influences science, technology, and the economy, are discussed. As automation enables

A Novel Cooling System to Reduce Thermally-Induced Errors of Machine Tools

June 14, 2007
Author(s)
M A. Donmez, Mahn-Hee Hahn, Johannes A. Soons
This study explores a method to reduce thermally-induced errors of machine tools through temperature stabilization with compressed air. The method uses inexpensive, specialy-shaped, silicon tubing wth small silts. Compressed air forced through such tubing

Robust Optimization for Smart Machining System: An Enabler for Agile Manufacturing

November 1, 2005
Author(s)
Laurent Deshayes, Lawrence A. Welsch, Robert W. Ivester, M A. Donmez
This paper reports our efforts towards developing a mathematical and information framework for optimization of machining processes within a Smart Machining System (SMS). An SMS uses diverse integrated technologies that enable an enterprise to: (1) produce