Building the Fastest Car in the World
World Land Speed Racing Association
Ed Shadle, Keith Zanghi
January, 2003 -
Lead Engineer, developing and testing next land speed record challenger.
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.
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.
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