Resumen
New developments in sensor technology, signal processing and control systems can result in more efficient manufacturing. Not all new process monitoring and optimisation schemes have yet been implemented. In this article, an extensive survey of recent developments in the field is presented, with the focus on tool condition monitoring of numerically controlled machines. The purpose of this review is to create an awareness of progress in the international arena and consequently contribute to a sharper focus in South African research efforts, and also to contribute to the implementation of new technology which can improve the competitiveness of the South African manufacturing industry.