Chatter Suppression of External Grooving Tools

Application of Spindle Speed Variation for Chatter Suppression in Turning

In the present paper the chatter instability of variable speed machining is studied. Though, there exist numerical methods for the computation of the stability lobes for variable speed machining, especially in turning processes the potential of an active spindle speed variation for chatter suppression is mostly unexploited. In the case of a slowly time-varying spindle speed, which is practicabl...

Data, tools and resources for mining social media drug chatter

Social media has emerged into a crucial resource for obtaining population-based signals for various public health monitoring and surveillance tasks, such as pharmacovigilance. There is an abundance of knowledge hidden within social media data, and the volume is growing. Drug-related chatter on social media can include user-generated information that can provide insights into public health probl...

Machine Tool Chatter Suppression Using Spindle Speed Variation

First part of the thesis deals with the dynamics and stability of nonlinear delay gyroscopic systems with periodically varying delay. The aim is to demonstrate that greater depths of cut may be achieved in a boring process (2 DOF) when the speed of the spindle is modulated sinusoidally instead of being kept constant. Since the variation of spindle speed is small and independent of the tool moti...

Chatter - Causes and Solutions

External Requirements of Groupware Development Tools

The EHCI’98 Workshop on Requirements of Groupware Development Tools examined six groupware applications in order to derive requirements for tools for developing groupware. We hope that these requirements will be useful to designers of new tools in motivating what features their tools should have.