This paper describes a technique based on envelope theory for deriving geometric properties of a globoidal type cam. The cam surface is taken to be the spatial envelope formed by a cylindrical cutting tool as it moves relative to the cam. The method employs a variation on classical envelope theory in that the three-dimensional problem of defining the cam surface is reduced to a set of two-dimensional ones. Results are presented to show that the cam surface form can be defined including values of pressure angles and cam surface curvatures for an illustrative case.
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