Development of an Abbe error compensator for NC machine tools
Date Issued
2011
Date
2011
Author(s)
Wang, Tsung-Han
Abstract
The displacement sensor (optical scale/encoder) is used as the position feedback for NC machine tool. However, all displacement sensors are never in line with the cutter point. Therefore, the accuracy of NC machine tool is mainly caused by angular errors of motion due to the well-known Abbe principle.
In the measurement system, the angle interferometer is developed for the detection of pitch、yaw angular errors. Moreover, a sensor that can measure roll angular error and 2D straightness is fabricated by use of laser source, optical component and two quadrant detectors. Finally, the angle interferometer and the roll sensor are integrated into 5DOF measurement system, which can measure pitch、yaw、roll angular errors and 2D straightness simultaneously.
Based on the 3axis vertical machining center and position feedback type (light scale or rotary encoder), the volumetric error for Abbe error is derived. In addition, the Abbe compensator for FANUC and PC-based controller is also developed.
For light scale position feedback, experiments show that the positioning error is majorly affected by Abbe error. For encoder position feedback, the accuracy is influenced not only by Abbe error but also by ball screw pitch error. Finally, the accuracy of NC machine tool must have a great improvement.
Subjects
Abbe error
volumetric error
three angle sensor
5 DOF measuring system
Abbe error compensator
Type
thesis
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