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You searched on: Author: jon pratt

Displaying records 81 to 90 of 92 records.
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81. 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 ...

82. 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 ...

83. 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 ...

84. 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 ...

85. 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 ...

86. Dynamic Interrogation of a Basic Cutting Process
Published: 7/1/1999
Authors: Matthew A. Davies, Michael Kennedy, Jon Robert Pratt, Christopher J. Evans
Abstract: A dynamic cutting fixture based on the test rig pioneered by Peters et al. has been developed to aid investigations of cutting process dynamics. This active fixture consists of a flexure-based tool holder with a single dominant modal direction, two v ...

87. A Wide Bandwidth Printed Wiring Board Transmission Line Probe
Published: 3/1/1999
Authors: Nicholas G Paulter Jr., Jon Robert Pratt
Abstract: An inexpensive, wide bandwidth, high cycle 50 {omega} probe is described for making electrical contact to printed wiring board planar transmission lines. The electrical transfer function of the probe and its contact repeatability are presented.

88. Frequency Domain Modal Estimation Techniques, Experimental Techniques
Published: 1/1/1998
Authors: S Fahey, Jon Robert Pratt
Abstract: In this brief, we discuss the estimation of modal parame-ters using single-degree-of-freedom approximations. Then, we proceed to review two multi-degree-of- freedom techniques for modal parameter estimations-the first based on dynamic matrices and th ...

89. On the dynamics of high-speed milling with long slender endmills
Published: 1/1/1998
Authors: Matthew A. Davies, A Schaut, Jon Robert Pratt, Brian S. Dutterer
Abstract: Tool deflections of high length-to-diameter ratio endmills are measured with capacitance probes during high-speed milling and compared with the predictions of regenerative chatter theory. Poincar? sectioning (once per revolution sampling) techniques ...

90. Time Domain Modal Estimation
Published: 1/1/1998
Authors: S Fahey, Jon Robert Pratt
Abstract: In a previous technical feature,2 we described some motives for performing structural dynamic tests and subsequently reviewed some frequency domain techniques for uncovering modal parameters. This time, we take up some applicable time domain algorith ...

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