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You searched on: Author: jon pratt

Displaying records 71 to 80 of 87 records.
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71. A New Stable Speed Test Apparatus for Milling
Published: 5/1/2001
Authors: J P Snyder, Jon Robert Pratt, Matthew A. Davies, S J Smith
Abstract: This paper describes a new device that uses a non-contact force actuator in conjunction with spindle rotation to produce an impulsive periodic driving force on the tool at the tooth passing frequency. Measurements are made of the applied and of the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821878

72. Towards a Traceable Nanoscale Force Standard
Published: 5/1/2001
Authors: Jon Robert Pratt, David B Newell, Edwin Ross Williams, Douglas T Smith, John A Kramar
Abstract: The National Institute of Standards and Technology has launched a five-year project to traceably link the International System of Units (SI) to forces between 10^u-8^N and 10^u-2^N. In this paper, we give a background and overview of this project, di ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821765

73. Towards a Traceable Nanoscale Force Standard
Published: 5/1/2001
Authors: Jon Robert Pratt, David B Newell, Edwin Ross Williams, Douglas T Smith, John A Kramar
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=9718

74. Chatter Control and Stability Analysis of a Cantilever Boring Bar Under Regenerative Cutting Conditions
Published: 1/1/2001
Authors: A H Nayfeh, Jon Robert Pratt
Abstract: A theoretical and experimental investigation into the stability of a slender boring bar under regenerative cutting conditions is presented. The bar has been equipped with actuators and sensors for feedback control of its structural dynamics. It is mo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821907

75. Regenerative Stablity Analysis of Highly Interrupted Machining
Published: 1/1/2001
Authors: Matthew A. Davies, Jon Robert Pratt, Brian S. Dutterer, Timothy J Burns
Abstract: We discuss theoretical and experimental work that supports the use of very low radia immersion in the high-speed milling of difficult-to-machine materials, such as titanium alloys. Our theory is based upon modeling the cutting process by a kicked ha ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821868

76. SI Traceability of Force at the Nanonewton Level
Published: 1/1/2001
Authors: David B Newell, Jon Robert Pratt, John A Kramar, Douglas T Smith, L Feeney, Edwin Ross Williams
Abstract: Although nanonewton force measurements are commonplace in industry, no National Measurement Institute supports a link to the International System of Units (SI) below one newton. The National Institute of Standards and Technology has launched a five-y ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821766

77. Stability Analysis of Interrupted Cutting With Finite Time in the Cut
Published: 1/1/2001
Authors: P V Bayly, J E Halley, Matthew A. Davies, Jon Robert Pratt
Abstract: The stability of interrupted cutting is examined for the case in which the tool is in contact with the work piece for a small, but finite, fraction of the tooth-passing period. A model of a single degree-of-freedom tool excited by intermittent, rege ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821864

78. Broadband Ac-dc Difference Calibrations of Current Shunts up to 100 A at NIST
Published: 7/1/2000
Authors: Joseph R. Mr. (Joseph R.) Kinard Jr., Thomas E Lipe, Clifton B. Childers, Owen Brede Laug, Jon Robert Pratt
Abstract: NIST is now offering broadband, ac-dc difference calibrations of current shunts from 3 A to 100 A, and at frequencies up to 30 kHz, as special tests. We present an overview of this new service including the design and construction of the NIST standar ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=24120

79. A Measurement System for Characterizing the Detection Performance of Metal Detectors: Design and Operation
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6530
Published: 6/1/2000
Authors: Nicholas G Paulter Jr., Donald R Larson, Jon Robert Pratt
Abstract: A measurement system for evaluating the performance of hand-held (HH) and walk-through (WT) metal detectors is described. These detectors produce time-varying magnetic fields that interact with objects comprised of electrically conductive and/or mag ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=13168

80. The Stability of Low Radial Immersion Milling
Published: 1/1/2000
Authors: Matthew A. Davies, Jon Robert Pratt, Brian S. Dutterer, Timothy J Burns
Abstract: Traditional regenerative stability theory predicts a set of spindle speeds with locally optimum stability at integer fractions of the natural frequency of the most flexible mode of the system.  The assumptions of this theory become invalid for h ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821851



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