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Productivity is a driver for machine tool design, and is characterized by the machine’s ability to remove material aggressively without resulting in unstable chatter vibrations. These vibrations are governed by the machine’s structural dynamics. Structural dynamics are typically asymmetrical, and limit the productivity potential of machines, making designers seek structural symmetry, which is non-trivial. This paper introduces a novel methodology to realize preferentially asymmetrical dynamics using the principle of vibration absorbers integrated with the machine using the receptance coupling approach. Preferentially asymmetrical structures are shown to have better speed-(in)dependent and feed-direction dependent productivity than symmetrical structures.

Machine tool design with preferentially asymmetrical structures to improve dynamics and productivity