Consideration of manufacturing parameters in the design of grooved globoidal cam indexing mechanisms

Abstract

Abstract

By considering the manufacturing variables involved in the processes of machining and assembly, analytical expressions for the turret motion and indexing accuracy of intermittent grooved globoidal cam mechanisms have been identified. Based on the kinematic and geometric relationships between the cam and its roller-follower turret, the effects on the output of the cam mechanism owing to clearances in the grooved cam and in the roller bearing, preload between the cam and its turret wheel and the cam taper angle have been investigated. As a result, the roller alternation in the cam-turret system has been analysed. Favourable parameters for the design, machining and assembly can be selected to manufacture such devices with improved turret motion and indexing accuracy. Worked examples are given to demonstrate the usefulness and effectiveness of the approach.