Method and apparatus for characterizing and enhancing the dynamic performance of machine tools

Barkman, William E; Babelay, Edwin F

Advanced Search OptionsAdvanced Search queries use a traditional Term Search. For more info, see our FAQ.

All Fields:

Patent Title:

Abstract:

Assignee:

Inventor(s):

Patent Number:

Patent Classification (CPC):

All Classifications
A - human necessities
A01 - agriculture
A21 - baking
A22 - butchering
A23 - foods or foodstuffs
A24 - tobacco
A41 - wearing apparel
A42 - headwear
A43 - footwear
A44 - haberdashery
A45 - hand or travelling articles
A46 - brushware
A47 - furniture
A61 - medical or veterinary science
A62 - life-saving
A63 - sports
A99 - subject matter not otherwise provided for in this section
B - performing operations
B01 - physical or chemical processes or apparatus in general
B02 - crushing, pulverising, or disintegrating
B03 - separation of solid materials using liquids or using pneumatic tables or jigs
B04 - centrifugal apparatus or machines for carrying-out physical or chemical processes
B05 - spraying or atomising in general
B06 - generating or transmitting mechanical vibrations in general
B07 - separating solids from solids
B08 - cleaning
B09 - disposal of solid waste
B21 - mechanical metal-working without essentially removing material
B22 - casting
B23 - machine tools
B24 - grinding
B25 - hand tools
B26 - hand cutting tools
B27 - working or preserving wood or similar material
B28 - working cement, clay, or stone
B29 - working of plastics
B30 - presses
B31 - making articles of paper, cardboard or material worked in a manner analogous to paper
B32 - layered products
B33 - additive manufacturing technology
B41 - printing
B42 - bookbinding
B43 - writing or drawing implements
B44 - decorative arts
B60 - vehicles in general
B61 - railways
B62 - land vehicles for travelling otherwise than on rails
B63 - ships or other waterborne vessels
B64 - aircraft
B65 - conveying
B66 - hoisting
B67 - opening, closing {or cleaning} bottles, jars or similar containers
B68 - saddlery
B81 - microstructural technology
B82 - nanotechnology
B99 - subject matter not otherwise provided for in this section
C - chemistry
C01 - inorganic chemistry
C02 - treatment of water, waste water, sewage, or sludge
C03 - glass
C04 - cements
C05 - fertilisers
C06 - explosives
C07 - organic chemistry
C08 - organic macromolecular compounds
C09 - dyes
C10 - petroleum, gas or coke industries
C11 - animal or vegetable oils, fats, fatty substances or waxes
C12 - biochemistry
C13 - sugar industry
C14 - skins
C21 - metallurgy of iron
C22 - metallurgy
C23 - coating metallic material
C25 - electrolytic or electrophoretic processes
C30 - crystal growth
C40 - combinatorial technology
C99 - subject matter not otherwise provided for in this section
D - textiles
D01 - natural or man-made threads or fibres
D02 - yarns
D03 - weaving
D04 - braiding
D05 - sewing
D06 - treatment of textiles or the like
D07 - ropes
D10 - indexing scheme associated with sublasses of section d, relating to textiles
D21 - paper-making
D99 - subject matter not otherwise provided for in this section
E - fixed constructions
E01 - construction of roads, railways, or bridges
E02 - hydraulic engineering
E03 - water supply
E04 - building
E05 - locks
E06 - doors, windows, shutters, or roller blinds in general
E21 - earth drilling
E99 - subject matter not otherwise provided for in this section
F - mechanical engineering
F01 - machines or engines in general
F02 - combustion engines
F03 - machines or engines for liquids
F04 - positive - displacement machines for liquids
F05 - indexing schemes relating to engines or pumps in various subclasses of classes f01-f04
F15 - fluid-pressure actuators
F16 - engineering elements and units
F17 - storing or distributing gases or liquids
F21 - lighting
F22 - steam generation
F23 - combustion apparatus
F24 - heating
F25 - refrigeration or cooling
F26 - drying
F27 - furnaces
F28 - heat exchange in general
F41 - weapons
F42 - ammunition
F99 - subject matter not otherwise provided for in this section
G - physics
G01 - measuring
G02 - optics
G03 - photography
G04 - horology
G05 - controlling
G06 - computing
G07 - checking-devices
G08 - signalling
G09 - education
G10 - musical instruments
G11 - information storage
G12 - instrument details
G16 - information and communication technology [ict] specially adapted for specific application fields
G21 - nuclear physics
G99 - subject matter not otherwise provided for in this section
H - electricity
H01 - basic electric elements
H02 - generation
H03 - basic electronic circuitry
H04 - electric communication technique
H05 - electric techniques not otherwise provided for
H99 - subject matter not otherwise provided for in this section
Y - new / cross sectional technologies
Y02 - technologies or applications for mitigation or adaptation against climate change
Y04 - information or communication technologies having an impact on other technology areas
Y10 - technical subjects covered by former uspc

More Options ...

Title: Method and apparatus for characterizing and enhancing the dynamic performance of machine tools

Abstract

Disclosed are various systems and methods for assessing and improving the capability of a machine tool. The disclosure applies to machine tools having at least one slide configured to move along a motion axis. Various patterns of dynamic excitation commands are employed to drive the one or more slides, typically involving repetitive short distance displacements. A quantification of a measurable merit of machine tool response to the one or more patterns of dynamic excitation commands is typically derived for the machine tool. Examples of measurable merits of machine tool performance include dynamic one axis positional accuracy of the machine tool, dynamic cross-axis stability of the machine tool, and dynamic multi-axis positional accuracy of the machine tool.

Inventors:: Barkman, William E; Babelay, Jr., Edwin F

Issue Date:: Tue Dec 17 00:00:00 EST 2013

Research Org.:: Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1110781

Patent Number(s):: 8610393

Application Number:: 12/760,115

Assignee:: Babcock & Wilcox Technical Services Y-12, LLC (Oak Ridge, TN)

Patent Classifications (CPCs):: G - PHYSICS G05 - CONTROLLING G05B - CONTROL OR REGULATING SYSTEMS IN GENERAL

Show more

G - PHYSICS G05 - CONTROLLING G05B - CONTROL OR REGULATING SYSTEMS IN GENERAL
G05B19/401 - characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes
G05B2219/37598 - Chip length

Show less

DOE Contract Number:: AC05-00OR22800

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION

Citation Formats


                    Barkman, William E, and Babelay, Jr., Edwin F. Method and apparatus for characterizing and enhancing the dynamic performance of machine tools.  United States: N. p., 2013. 
        Web.

Copy to clipboard


                    Barkman, William E, & Babelay, Jr., Edwin F. Method and apparatus for characterizing and enhancing the dynamic performance of machine tools.  United States.

Copy to clipboard


                    Barkman, William E, and Babelay, Jr., Edwin F. Tue .  
        "Method and apparatus for characterizing and enhancing the dynamic performance of machine tools".  United States.  https://www.osti.gov/servlets/purl/1110781.

Copy to clipboard


                    
@article{osti_1110781,

  title        = {Method and apparatus for characterizing and enhancing the dynamic performance of machine tools},

  author       = {Barkman, William E and Babelay, Jr., Edwin F},

  abstractNote = {Disclosed are various systems and methods for assessing and improving the capability of a machine tool. The disclosure applies to machine tools having at least one slide configured to move along a motion axis. Various patterns of dynamic excitation commands are employed to drive the one or more slides, typically involving repetitive short distance displacements. A quantification of a measurable merit of machine tool response to the one or more patterns of dynamic excitation commands is typically derived for the machine tool. Examples of measurable merits of machine tool performance include dynamic one axis positional accuracy of the machine tool, dynamic cross-axis stability of the machine tool, and dynamic multi-axis positional accuracy of the machine tool.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Tue Dec 17 00:00:00 EST 2013},

  month        = {Tue Dec 17 00:00:00 EST 2013}

}

Copy to clipboard

Patent:

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

Cutting process control system for CNC metal cutting machine tools
patent, September 1989

Kolomeets, Sergei D.; Krivoshlykov, Alexei J.; Ostafiev, Vladimir A.
US Patent Document 4,866,360
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/4866360

Multiple Path Numerical Control System
patent, March 1971

Tipton, James P.
US Patent Document 3569682
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/3569682

Numerically controlled machine tool
patent, May 1977

Bourrat, Pierre; Gosset, Paul Xavier; Riss, Pierre
US Patent Document 4,027,245
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/4027245

Optical Line Following Program Control System
patent, January 1975

Dell, William; Parker, Robert E.
US Patent Document 3860862
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/3860862

Machining method using numerical control apparatus
patent, September 1998

Hirai, Hayao; Fujimoto, Akihiko
US Patent Document 5,815,400
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5815400

Numerical control system for controlling both a machine tool and a robot
patent, September 1982

Kobayashi, Kengo; Inaba, Hajimu; Sakakibara, Shinsuke
US Patent Document 4,348,623
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/4348623

Sampled Data Numerical Contouring Machine Controller Apparatus and Method Providable with on Line Capability for Contour Cornering Deceleration and Acceleration
patent, October 1972

Middleditch, Alan E,
US Patent Document 3699317
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/3699317

Positioning controlling device
patent, February 1991

Sugita, Kazuhiko; Sakakibara, Norio; Hori, Nobumitsu
US Patent Document 4,992,711
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/4992711

Fuel container for a spirit stove
patent, January 2000

Ebbeson, Bengt
US Patent Document 6,012,446
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6012446

Methods and systems for chip breaking in turning applications using CNC toolpaths
patent, August 2012

Woody, Bethany A.; Smith, Kevin Scott; Adams, David J.
US Patent Document 8,240,234
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/8240234

Demodulator for Magnetic Milling Force Sensors
patent, December 1973

Whetham, William J.
US Patent Document 3777125
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/3777125

Development and application of a system for evaluating the feed-drive errors on computer numerically controlled machine tools
journal, October 1996

Kwon, H. D.; Burdekin, M.
Precision Engineering, Vol. 19, Issue 2-3, p. 133-140
https://doi.org/10.1016/S0141-6359(96)00044-X

Dynamical instrument for machining
patent, March 2008

Hill, Wayne S.; Barck, Bruce N.
US Patent Document 7,341,410
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/7341410

Servo motor controlling method
patent, February 2010

Matsumoto, Ichiro; Fujita, Jun; Hamamura, Minoru
US Patent Document 7,659,682
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/7659682

Cutting tools and drill inserts with chip control geometry
patent, August 2001

Fang, X. Daniel; Hartman, Thomas B.; Wills, David J.
US Patent Document 6,270,297
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6270297

Measuring method and device, machine tool having such device, and work processing method
patent, December 2005

Kaneda, Kitahiro; Kurahashi, Yasuhiro
US Patent Document 6,973,738
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6973738

Adaptive feed rate override system for a milling machine
patent, October 1987

Jeppsson, Jan-Bertil
US Patent Document 4,698,773
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/4698773

Method and Apparatus for Producing Signals Representing the Most Significant Eccentricities of a Plurality of Simultaneously Rotating Spindles
patent, August 1972

Pilafidis, Emile J.; Viswanathan, Thiagarajan
US Patent Document 3752968
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/3752968

A new calibration method for parallel kinematics machine tools using orientation constraint
journal, July 2009

Ren, Xiao-Dong; Feng, Zu-Ren; Su, Cheng-Ping
International Journal of Machine Tools and Manufacture, Vol. 49, Issue 9
https://doi.org/10.1016/j.ijmachtools.2009.03.004

Predictive modeling of surface roughness and tool wear in hard turning using regression and neural networks
journal, April 2005

Özel, Tuğrul; Karpat, Yiğit
International Journal of Machine Tools and Manufacture, Vol. 45, Issue 4-5, p. 467-479
https://doi.org/10.1016/j.ijmachtools.2004.09.007

Machine tool control system
patent, September 2011

Gray, Paul J.
US Patent Document 8,024,068
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/8024068

Combination grinding machine
patent, June 2002

Mukai, Ryohei; Katsuta, Mamoru; Terahara, Goro
US Patent Document 6,409,573
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6409573

System and method for surface finish management
patent, April 2011

Lankalapalli, Kishore; Gorgol, Jr., Robert J.; Hao, Yongxing
US Patent Document 7,933,677
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/7933677

Systems and methods for automated sensing and machining for repairing airfoils of blades
patent, June 2005

Wang, Weiping; Lee, Martin Kin-Fei; Wei, Bin
US Patent Document 6,912,446
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6912446

Machine tool spindle calibration method and apparatus
patent, March 1976

Hohberger, Clive
US Patent Document 3,945,297
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/3945297

Method and apparatus for grinding a workpiece
patent, October 1997

Sakakura, Moriaki; Hotta, Takayuki; Abeta, Satoshi
US Patent Document 5,679,053
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5679053

Method for assessing accuracy of positioning of a multi-axis numerically controlled machine
patent, June 2005

Coleman, Richard M.; McCrum, Russell C.
US Patent Document 6,909,517
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6909517

Method for improving the critical dimension uniformity of patterned features on wafers
patent, June 2007

Gau, Tsai-Sheng; Shin, Jaw-Jung; You, Jan-Wen
US Patent Document 7,234,128
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/7234128

Method of determining feed rate and cutting speed for cutting metal and of predicting cutting effects
patent, November 1987

Anderson, David A.
US Patent Document 4,707,793
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/4707793

Development of a measuring method for motion accuracy of NC machine tools using links and rotary encoders
journal, January 2009

Iwai, Hiroaki; Mitsui, Kimiyuki
International Journal of Machine Tools and Manufacture, Vol. 49, Issue 1
https://doi.org/10.1016/j.ijmachtools.2008.06.011

Tool touch probe system and method of precision machining
patent, January 1984

Zurbrick, John R.; Kelley, John R.
US Patent Document 4,428,055
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/4428055

Tool grinding simulation system
patent, January 2002

Brien, Glenn C.; Stewart, Nigel; Simakov, Mikhail
US Patent Document 6,341,996
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6341996

Active electromagnetic device for measuring the dynamic response of a tool in a CNC machine
patent, January 2006

Esterling, Donald
US Patent Document 6,993,410
URL: https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/6993410

Similar Records in DOE Patents and OSTI.GOV collections:

Method and apparatus for characterizing and enhancing the functional performance of machine tools

Patent Barkman, William E; Babelay, Jr., Edwin F; Smith, Kevin Scott; ...

Disclosed are various systems and methods for assessing and improving the capability of a machine tool. The disclosure applies to machine tools having at least one slide configured to move along a motion axis. Various patterns of dynamic excitation commands are employed to drive the one or more slides, typically involving repetitive short distance displacements. A quantification of a measurable merit of machine tool response to the one or more patterns of dynamic excitation commands is typically derived for the machine tool. Examples of measurable merits of machine tool performance include workpiece surface finish, and the ability to generate chipsmore » of the desired length. « less
Full Text Available
Method and apparatus for suppressing regenerative instability and related chatter in machine tools

Patent Segalman, Daniel J [Albuquerque, NM]; Redmond, James M [Albuquerque, NM]

Methods of and apparatuses for mitigating chatter vibrations in machine tools or components thereof. Chatter therein is suppressed by periodically or continuously varying the stiffness of the cutting tool (or some component of the cutting tool), and hence the resonant frequency of the cutting tool (or some component thereof). The varying of resonant frequency of the cutting tool can be accomplished by modulating the stiffness of the cutting tool, the cutting tool holder, or any other component of the support for the cutting tool. By periodically altering the impedance of the cutting tool assembly, chatter is mitigated. In one embodiment,more » « less
Full Text Available
Method and apparatus for suppressing regenerative instability and related chatter in machine tools

Patent Segalman, Daniel J [Albuquerque, NM]; Redmond, James M [Albuquerque, NM]

Methods of and apparatuses for mitigating chatter vibrations in machine tools or components thereof. Chatter therein is suppressed by periodically or continuously varying the stiffness of the cutting tool (or some component of the cutting tool), and hence the resonant frequency of the cutting tool (or some component thereof). The varying of resonant frequency of the cutting tool can be accomplished by modulating the stiffness of the cutting tool, the cutting tool holder, or any other component of the support for the cutting tool. By periodically altering the impedance of the cutting tool assembly, chatter is mitigated. In one embodiment,more » « less
Full Text Available
Method and apparatus for monitoring machine performance

Patent Smith, Stephen F [Loudon, TN]; Castleberry, Kimberly N [Harriman, TN]

Machine operating conditions can be monitored by analyzing, in either the time or frequency domain, the spectral components of the motor current. Changes in the electric background noise, induced by mechanical variations in the machine, are correlated to changes in the operating parameters of the machine.
Full Text Available
Method and precision nanopositioning apparatus with compact vertical and horizontal linear nanopositioning flexure stages for implementing enhanced nanopositioning performance

Patent Shu, Deming; Lai, Barry; Kearney, Steven P.; ...

An enhanced method and precision nanopositioning apparatus for implementing enhanced nanopositioning performance is provided. The nanopositioning apparatus includes a vertical linear nanopositioning flexure stage and a horizontal linear nanopositioning flexure stage. The vertical linear nanopositioning flexure stage includes a stage base, a symmetrically configured flexure linear guiding mechanism with precision motion enhancement structure, and a stage carriage. The horizontal linear nanopositioning flexure stage is mounted on the stage carriage of the vertical linear nanopositioning flexure stage, and includes a middle-bar relative position control mechanism to enhance the stiffness of a flexure linear guiding mechanism.
Full Text Available

Similar Records

Title: Method and apparatus for characterizing and enhancing the dynamic performance of machine tools

Abstract

Citation Formats

Cutting process control system for CNC metal cutting machine tools patent, September 1989

Multiple Path Numerical Control System patent, March 1971

Numerically controlled machine tool patent, May 1977

Optical Line Following Program Control System patent, January 1975

Machining method using numerical control apparatus patent, September 1998

Numerical control system for controlling both a machine tool and a robot patent, September 1982

Sampled Data Numerical Contouring Machine Controller Apparatus and Method Providable with on Line Capability for Contour Cornering Deceleration and Acceleration patent, October 1972

Positioning controlling device patent, February 1991

Fuel container for a spirit stove patent, January 2000

Methods and systems for chip breaking in turning applications using CNC toolpaths patent, August 2012

Demodulator for Magnetic Milling Force Sensors patent, December 1973

Development and application of a system for evaluating the feed-drive errors on computer numerically controlled machine tools journal, October 1996

Dynamical instrument for machining patent, March 2008

Servo motor controlling method patent, February 2010

Cutting tools and drill inserts with chip control geometry patent, August 2001

Measuring method and device, machine tool having such device, and work processing method patent, December 2005

Adaptive feed rate override system for a milling machine patent, October 1987

Method and Apparatus for Producing Signals Representing the Most Significant Eccentricities of a Plurality of Simultaneously Rotating Spindles patent, August 1972

A new calibration method for parallel kinematics machine tools using orientation constraint journal, July 2009

Predictive modeling of surface roughness and tool wear in hard turning using regression and neural networks journal, April 2005

Machine tool control system patent, September 2011

Combination grinding machine patent, June 2002

System and method for surface finish management patent, April 2011

Systems and methods for automated sensing and machining for repairing airfoils of blades patent, June 2005

Machine tool spindle calibration method and apparatus patent, March 1976

Method and apparatus for grinding a workpiece patent, October 1997

Method for assessing accuracy of positioning of a multi-axis numerically controlled machine patent, June 2005

Method for improving the critical dimension uniformity of patterned features on wafers patent, June 2007

Method of determining feed rate and cutting speed for cutting metal and of predicting cutting effects patent, November 1987

Development of a measuring method for motion accuracy of NC machine tools using links and rotary encoders journal, January 2009

Tool touch probe system and method of precision machining patent, January 1984

Tool grinding simulation system patent, January 2002

Active electromagnetic device for measuring the dynamic response of a tool in a CNC machine patent, January 2006

Cutting process control system for CNC metal cutting machine tools
patent, September 1989

Multiple Path Numerical Control System
patent, March 1971

Numerically controlled machine tool
patent, May 1977

Optical Line Following Program Control System
patent, January 1975

Machining method using numerical control apparatus
patent, September 1998

Numerical control system for controlling both a machine tool and a robot
patent, September 1982

Sampled Data Numerical Contouring Machine Controller Apparatus and Method Providable with on Line Capability for Contour Cornering Deceleration and Acceleration
patent, October 1972

Positioning controlling device
patent, February 1991

Fuel container for a spirit stove
patent, January 2000

Methods and systems for chip breaking in turning applications using CNC toolpaths
patent, August 2012

Demodulator for Magnetic Milling Force Sensors
patent, December 1973

Development and application of a system for evaluating the feed-drive errors on computer numerically controlled machine tools
journal, October 1996

Dynamical instrument for machining
patent, March 2008

Servo motor controlling method
patent, February 2010

Cutting tools and drill inserts with chip control geometry
patent, August 2001

Measuring method and device, machine tool having such device, and work processing method
patent, December 2005

Adaptive feed rate override system for a milling machine
patent, October 1987

Method and Apparatus for Producing Signals Representing the Most Significant Eccentricities of a Plurality of Simultaneously Rotating Spindles
patent, August 1972

A new calibration method for parallel kinematics machine tools using orientation constraint
journal, July 2009

Predictive modeling of surface roughness and tool wear in hard turning using regression and neural networks
journal, April 2005

Machine tool control system
patent, September 2011

Combination grinding machine
patent, June 2002

System and method for surface finish management
patent, April 2011

Systems and methods for automated sensing and machining for repairing airfoils of blades
patent, June 2005

Machine tool spindle calibration method and apparatus
patent, March 1976

Method and apparatus for grinding a workpiece
patent, October 1997

Method for assessing accuracy of positioning of a multi-axis numerically controlled machine
patent, June 2005

Method for improving the critical dimension uniformity of patterned features on wafers
patent, June 2007

Method of determining feed rate and cutting speed for cutting metal and of predicting cutting effects
patent, November 1987

Development of a measuring method for motion accuracy of NC machine tools using links and rotary encoders
journal, January 2009

Tool touch probe system and method of precision machining
patent, January 1984

Tool grinding simulation system
patent, January 2002

Active electromagnetic device for measuring the dynamic response of a tool in a CNC machine
patent, January 2006