Kyoto University Graduate School of Engineering Department of Micro Engineering
Machining Measurement and Control Laboratory

Servo Control of NC Machine Tools

We have been researching various issues in motion control of a feed drive system of machining centers. These motion control issues became of more importance due to recent trend of high-speed machining.

We have been researching on various issues related to motion control of a feed drive system of NC machine tools. These motion control issues became of more importance due to recent trend of high-speed machining, and technological progress in high-precision and ultra-precision machine tools. We have proposed various approaches to address issues related to servo control from various viewpoints such as control technology, measurement technology, and mechanical components.

Automated Tuning of Servo Parameters Automated Tuning of Servo Parameters
Based on the measurement of contouring error of feed drives, a scheme to automatically tune servo parameters in CNC servo control systems has been proposed (March, 2004).

Design of Anti-vibration Filter by using the Numerical Optimization Design of Anti-vibration Filter by using the Numerical Optimization
A practical design scheme of a higher-order anti-vibration filter by using the numerical optimization was proposed. It was applied to the resonance vibration control of ball screw driven feed drives (March, 2004).

Development of the Variable-Friction Guideway Development of the Variable-Friction Guideway
The guideway that can actively control the friction on a guideway was developed, and was applied to the vibration suppression in high-speed operations (March, 2003).

Damping control by Relative Velocity Feedback Scheme and Dual Actuation Damping control by Relative Velocity Feedback Scheme and Dual Actuation
We have proposed a damping control scheme of the vibration on a ball-screw driven feed drive by using the relative velocity feedback scheme and the dual actuation using a linear motor as a sub-actuator (June, 2002).

Analysis and Compensation of Stick Motion Analysis and Compensation of Stick Motion
The stick motion is a motion error which appears in circular interpolation due to the friction between a slide table and guides. This project focuses on mathematical modeling of the stick motion and its compensation (March, 2001).