Gregory J Duncan

US Patent:

7536924, May 26, 2009

Filed:

Sep 29, 2005

Appl. No.:

11/576200

Inventors:

Tony Lavaun Schmitz - Gainesville FL, US
Gregory Scott Duncan - Gainesville FL, US
John Charles Ziegert - Gainesville FL, US
David Corbin Burton - Carolina Beach NC, US

Assignee:

University of Florida Research Foundation, Inc. - Gainesville FL

International Classification:

G01L 25/00
G01L 5/10
G01L 1/10

US Classification:

7386241, 7386259, 73 108

Abstract:

A high frequency flexure-based dynamometer for measuring vibrations to use in determining cutting forces in a tool is disclosed. The dynamometer device may operate within a pre-selected high frequency range while measuring cutting forces less than about 1 N. The dynamometer may include two coupled flexures that interact to produce vibration modes at the edge of a selected bandwidth of interest. These modes may produce a frequency response function within the desired frequency band that has a magnified response and is substantially constant. The dynamometer may include a workpiece mounted to one of the two flexures and a one or more precision accelerometers mounted to the first or second flexures. Finite element analysis may be used to optimize the flexure design.

US Patent:

8131525, Mar 6, 2012

Filed:

Apr 7, 2006

Appl. No.:

11/910947

Inventors:

Tony L. Schmitz - Gainesville FL, US
Gregory S. Duncan - Gainesville FL, US

Assignee:

University of Florida Research Foundation, Inc. - Gainesville FL

International Classification:

G06G 7/48

US Classification:

703 7, 700160, 700177

Abstract:

A method for predicting a tool point response of a spindle-holder-tool assembly to be used for high-speed machining applications is provided. The method includes determining direct and cross displacement-to-force receptances of a standard holder clamped in the spindle. The method also includes determining direct receptances at a free end of the standard holder based upon the determined direct and cross displacement-to-force receptances of the standard holder. Additionally, the method includes performing an inverse receptance coupling to simulate a decomposition of the standard holder into multiple subassemblies, the subassemblies including a spindle-holder base subassembly and an extended holder subassembly. The method further includes determining spindle-holder base subassembly receptances based upon the simulated decomposition of the standard holder.

US Patent:

20070088456, Apr 19, 2007

Filed:

Oct 2, 2006

Appl. No.:

11/537859

Inventors:

Tony Schmitz - Gainesville FL, US
Gregory Duncan - Gainesville FL, US

Assignee:

University of Florida Research Foundation, Inc. - Gainesville FL

International Classification:

G06F 19/00

US Classification:

700175000, 700177000

Abstract:

A method for predicting a tool point response of a spindle-holder-tool assembly to be used for high-speed machining applications is provided. The method includes determining direct and cross displacement-to-force receptances of a standard holder secured in the spindle based upon measurements of displacement-to-force taken at different rotating speeds of the spindle. The method also includes determining direct receptances at a free end of the standard holder based upon the determined direct and cross displacement-to-force receptances of the standard holder. Additionally, the method includes performing an inverse receptance coupling to simulate a decomposition of the standard holder into multiple subassemblies, the subassemblies including a spindle-holder base subassembly and an extended holder subassembly. The method further includes determining spindle-holder base subassembly receptances based upon the simulated decomposition of the standard holder.