Out-of-roundness compensation technique in machining of femoral head prosthesis using conventional CNC machine

Abstract

In manufacturing of femoral head prostheses, the roundness of the femoral head is important. In order to reduce out-of-roundness when machining with a conventional CNC machine, a compensation technique with a fast tool servo was developed. The fast tool servo with piezoelectric actuator was fabricated and installed on a conventional CNC machine, and a compensation technique was implemented to compensate for the out-of-roundness. The profiles of machined femoral heads were analyzed and used to develop a representative profile. The experiment was conducted to confirm the prior statistical analysis. The results show that the compensation technique reduced the out-of-roundness of femoral head prostheses to 4.04 ± 0.54 μm.