Abstract:

To generate a given spherical motion, three programme controlled servo devices are commonly used. Considering the periodicity and small travel space, a new method is developed in this paper in which a combinatory cam is used to control three points of the spherical moving body at the same time. The combinatory cam consists of two disk cams and one cylindrical cam, of which the axes are in the same line. Obviously, it is much simpler,cheaper and more reliable than the common method.

Key words: periodicity, spherical motion, combinatory cam