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The standard of test method for five-axis machining center is now under discussion by ISO. In its draft standard, the use of a measurement device with three displacement sensor is described in addition to the ball bar device that is well-known as the motion measurement device for machine tools. In this study, a device that was able to take the setting method freely was designed and prototyped. Using the newly-designed device, three setting method installed on the machine were compared. One is of the conventional setting method developed in Europe, another is the method that sensors axes are parallel to the machine axes, the other is that the device is attached on the machine spindle. Since the compared results show little difference, the setting method can be decided by convenience of the easiness of installation on the machine such as centering of the master ball, collision prevention and sensor’s cable treatment. The measured results on two five-axis machining centers were also considered. The typical error was that the straightness error motion of linear axes, which is difficult to detect by the ball bar test. Both bidirectional repeatability error and cyclic errors are detected as the straightness error.

Design of motion accuracy measurement device with three displacement sensors for machine tool and comparison of its setting method