Steven Wallace Avatar

Steven Wallace

Research Engineer

San Jose State University: BS; De Anza College: AS, AA. Currently with The Boeing Company (27 years) in Machining Technology Development; Associated with the metalworking industry since 1977; Extensive experience in machining dynamics, sensors, computer science, modal analysis.

experience

Engineer / Scientist  
Boeing, September 1990 to Present

• Machining Technology Development • Titanium machining, Process Modeling, CATIA V5 user • Advanced modal analysis techniques for High Speed Machining • Instructor, “Machining Technology in Aerospace Manufacturing” • Boeing Design Manual custodian for BDM1326 “Machined Parts Design” • Data acquisition, vibration signal analysis, and system simulation of metal removal processes • Vice President, ASME Standardization and Testing (2014) • ASME Board on Standardization and Testing • ASME Vice Chair, Strategic Initiatives, Board on Standards and Certification • Chair, ASME B5 Machine Tools • Management and supervision of the dimensional, design, application, drafting, and performance test codes and miscellaneous standards activities of the Society, The standards developed by groups managed by the board are submitted to the American National Standards Institute to become American National Standards.

Mechanical Engineeer  
Varian Associates, September 1979 to September 1990, Palo Alto, California United States
(Defense Electronics)
Sheet metal Worker, Then Mechanical Technician, then Mechanical Engineer!

Apprentice  
NASA - Ames Research Center, September 1977 to September 1979, Mountain View, California United States
(Air and Space Research)
Sheet metal and welding apprenticeship while working on wind tunnel models and research aircraft.

education

San Jose State University  
Bachelor's degree, Industrial Technology, Jan, 1981 to Jan, 1985


projects

World Land Speed Racing Association  by  Ed Shadle, Keith Zanghi    
January, 2003 - Present
Lead Engineer, developing and testing next land speed record challenger.

patents

Modal Impact Testing Assembly, System and Method  (US 9,134,212, B2)    
Inventors: Steven G. Wallace.  Issued September 15, 2015  in United States

The modal impact testing assembly enables modal impact testing of a test element that is rotating at operational speeds.

RECEIVERS AND METHODS FOR FORMING SUCH RECEIVERS  (Application No. 14/728785)    
Inventors: Steven G. Wallace.  Filed June 15, 2015  in United States

In one imbodiment, as implemeted for use on a machining center, this invention prevents a machining cutter, such as an end mill or, more generally, a shank, from “walking out” of its receiver (or collet) when used for heavy machining operations during which large quantities of material are machined away in a single pass. Such “walk-out” of the cutter leads to a loss of machining accuracy, thus significantly increasing manufacturing costs.

Frictional Coupling  (US20140245584A1 )    
Inventors: Steven G. Wallace.  Filed January 15, 2012  in United States

An anisotropic non-slip coupling between two parts may include a first part having an anisotropic surface pattern formed thereon, and a second part having a surface shape to receive the first part in an interference fit, wherein the anisotropic surface pattern is oriented to provide directional slippage of the first part relative to the second part in a direction that facilitates engagement of the first and second parts in response to vibration of at least one of the first and second parts, and resists slippage of the first part relative to the second part in an opposite direction.

publications

Elimination of Vibration Induced Machine Damage through Modal Analysis and Computerized Modeling     
Published by (SAE)
Authors: Steven G. Wallace.  Published October 01, 1996

Increased demand for machining with higher material removal rates necessitates the use of higher rotational speeds and higher side loads during the cutting process. These new machining parameters manifest themselves as chronic degenerative problems with spindles and tool holder taper interfaces. Regenerative vibrations serve to complicate this condition and greatly contribute to the severity of this degenerative process. This paper describes solutions for these recent machining process problems to manufacturing engineers and machine tool builders. An overview of the complicated processes that cause vibration induced damage to machine tools is presented in simple terms. The objective is to give the reader a basic understanding of vibration induced machine damage, and several ways to combat this problem. A fresh look at the problems associated with higher rotational speeds, high side forces, and material removal rates, with knowledge of Finite Element Analysis and Vibration Analysis techniques can solve many machining production problems of recent years.