Application of the Three Dimensional Coordinate Measuring Machine (CAD/CAM for the New Cosmetic Hand)
Yukio Saito*, Takanori Higashihara*, Torn Oshima**, and Takamitu Tajima*
*Faculty of Science and Technology, Tokyo Denki University, Hatoyama, Hiki, Saitama 350-03, Japan
**Tokyo Metropolitan Prosthetic and Orthotic Research Institute, 3-17-3 Toyama, Shinjuku 162, Japan
The purpose of this research was to develop a CAD/ CAM system for soft objects such as the human hand. In this article are described the various steps in this process, including digitization of the shape by automatic measurement of the object shape processing such as shape interpolation and correction, additional shape processing, motion simulation for the digitized soft model, and reproduction of the shape as a positive model. As an example, we established a method for making a new cosmetic hand that could meet the necessary requirements of shape and functionality. For the shape, we measured the natural hand of a disabled person automatically with a three-dimensional coordinate measuring machine, performed data processing, and produced a positive model for the cosmetic hand. For functionality, we simulated the change of surface shape caused by finger motion using the shape of the measured hand, and then developed the inside mechanism of the cosmetic hand. This article describes the system developed for application to the cosmetic hand.