Improving Indexing Accuracy of Grooved Globoidal Cam Mechanisms Using Asymmetrical Turret Motions

A design procedure for increasing the indexing accuracy of intermittent grooved globoidal cam mechanisms is presented. It is based on the synthesis of asymmetrical dwell-rise-dwell (D-R-D) roller-follower turret motions to improve the kinematic and dynamic performance of the globoidal cam-turret devices for high-speed applications. Such asymmetrical turret motion curves are defined and tuned by nonparametric rational B-splines. Favorable results of kinematic characteristics, geometric properties including pressure angles and curvatures of cam surfaces, torques, and residual vibrations are revealed and compared to those obtained by traditional methods. Together with experimental results, a practical application example is given to demonstrate the usefulness and effectiveness.