Abstract

This paper presents the mechanical and servo control design of a fast tool servo for machining noncircular bores. The rotating boring bar varies the depth of cut dynamically to machine noncircular bores, such as those in engine piston gudgeon pin holes. The piezoelectric actuator driven fast tool servo has 60 micron displacement and about 400 Hz first natural frequency. The design of robust repetitive control of the fast tool servo is discussed and experimental results of cutting tool motion for generating oval bore profiles are presented.

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