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Author: jon pratt

Displaying records 61 to 70 of 82 records.
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61. Stability Prediction For Low Radial Immersion Milling
Published: 5/1/2002
Authors: Matthew A. Davies, Jon Robert Pratt, Brian S. Dutterer, Timothy J Burns
Abstract: Traditional regenerative stability theory predicts a set of optimally stable spindle speeds at integer fractions of the national frequency of the most flexible mode of the system. The assumptions of this theory become invalid for highly interrupted m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821924

62. A Flexure Balance With Adjustable Restoring Torque for Nanonewton Force Measurement
Published: 1/1/2002
Authors: Jon Robert Pratt, David B Newell, John A Kramar
Abstract: The NIST electrostatic force balance compares mechanical probe forces to an SI realization of force derived from measurements of the capacitance gradient and voltage in an electronic null balance. As we approach the nanonewton regime, the finite stif ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=822422

63. Interrupted machining-a Doubling in the Number of Stability Lobes? Part 1 Theoretical Development
Published: 1/1/2002
Authors: Matthew A. Davies, Jon Robert Pratt, Brian S. Dutterer, Timothy J Burns
Abstract: Traditional regenerative stability theory predicts sets of spindle speeds that are most resistant to the development of chatter.  Considering regeneration alone, these spindle speeds are approximately at integer fractions of the natural frequenc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820085

64. NIST Electrostatic Force Balance Experiment
Published: 1/1/2002
Authors: John A Kramar, David B Newell, Jon Robert Pratt
Abstract: We have designed and built a prototype electrostatic force balance for realizing forces in the micronewton range. The active electrodes are concentric cylinders, the outer serving as the reference and the inner suspended and guided by a rectilinear f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821769

65. SI Traceability of Force at the Nanonewton Level
Published: 7/1/2001
Authors: David B Newell, Jon Robert Pratt, John A Kramar, Douglas T Smith, L. A. 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- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=7241

66. 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

67. 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

68. 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

69. 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

70. 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



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