Abstract: When traditional A-B-C method is used for sided balancing machine, the measurement error is too large to meet the requirement as ignoring the influence of the vibration system’s torsion. Assessing application scope of ABC method is crucial to improve dynamic balance accuracy. So this paper established the vibration model of swing frame for sided horizontal balancing machine, calculated the location of vibration center of swing frame, deduced the torsional stiffness formula of a rectangular plate spring twisting around the vibration center, analyzed the relationship between torsional stiffness and location dimensions of the plate spring; Verified the measurement error caused by using traditional statics methods by experiments, compared the torsional stiffness deduced by experiment with that calculated by theory, analyzed how the torsional situation of plate spring effects the separation ratio of sided balancing machines; estimated the influence of torsional vibration on measurement error and assessed the application scope of ABC method.
