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

By considering the manufacturing variables involved in the processes of mac hining and assembly, analytical expressions for the turret motion and index ing accuracy of intermittent grooved globoidal cam mechanisms have been ide ntified. Based on the kinematic and geometric relationships between the cam and its roller-follower turret, the effects on the output of the cam mecha nism owing to clearances in the grooved cam and in the roller bearing, prel oad 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 asse mbly can be selected to manufacture such devices with improved turret motio n and indexing accuracy. Worked examples are given to demonstrate the usefu lness and effectiveness of the approach.