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Development of Workpiece Positioning System for Machining Micro-Pits of Hip Implant
Дата публикации: 12-04-2026 22:00:00
Publication date: 13 April 2026
Source: Applied Mechanics and Materials Vol. 935
Author(s): Azli Yahya, Nasrul Humaimi, Kartiko Nugroho, Zahran Khudzari, Jaysuman Puspanathan
This paper describes a development of Electrical Discharge Machining (EDM) system for biomedical application. In general, the mechanism of EDM comprises of mechanical structure and electronic control system. This laboratory scale of the EDM system has a capability to accommodate the machining of hip implant which employs low power generator. The holder for the workpiece is created to accurately position the hip implant, ensuring that the machining angle of the implant directs the micro-pits precisely toward the workpiece. A traditional linear x-y-z axis setup (Cartesian coordinate system) is utilized, along with two types of spherical coordinates (swing-swing and swing-rotate configurations). By the results of performance test, the Swing Motor behaves differently to the common servo motor. The Swing Motor is affected by unbalanced load and gravity in which the Ziegler-Nichols PID optimization method has been altered from the conventional model. The average of absolute error is 0.2308 degrees. However, optimized PI controller by Ziegler-Nichols method is able to eliminate the effect in term of final achieved position (steady state condition) and fulfil the objectives.
Основное содержимое страницы с новостью.
This paper describes a development of Electrical Discharge Machining (EDM) system for biomedical application. In general, the mechanism of EDM comprises of mechanical structure and electronic control system. This laboratory scale of the EDM system has a capability to accommodate the machining of hip implant which employs low power generator. The holder for the workpiece is created to accurately position the hip implant, ensuring that the machining angle of the implant directs the micro-pits precisely toward the workpiece. A traditional linear x-y-z axis setup (Cartesian coordinate system) is utilized, along with two types of spherical coordinates (swing-swing and swing-rotate configurations). By the results of performance test, the Swing Motor behaves differently to the common servo motor. The Swing Motor is affected by unbalanced load and gravity in which the Ziegler-Nichols PID optimization method has been altered from the conventional model. The average of absolute error is 0.2308 degrees. However, optimized PI controller by Ziegler-Nichols method is able to eliminate the effect in term of final achieved position (steady state condition) and fulfil the objectives.
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