Abstract
In order to achieve the further improvements to speed and accuracy of NC machine tools, a variety of devices for measuring the motion accuracy have been developed. But the existing methods, for example DBB method (Double Ball Bar method) etc., are the measuring method for only circular motion and difficult to measure along arbitrary tool path in a three dimensional space. We developed the measuring method using links and rotary encoders and have improved it. And this time, we aimed the expansion of measuring range applying the counter weight. The repeatability of the measurements has also been investigated.
