A new approach of defining the grinding wheel profile of the Gear Hob’s Rake Face

This paper presents a new approach to defining the grinding wheel profile used for module gear hob’s helical rake face grinding. After a brief presentation of former results, the geometric and mathematic model of the grinding is analyzed. The model differs from those based on the classical meshing theory, using instead the method of the space restriction, when one of the involved surfaces splits the 3D space in two subspaces. The revolution surface of the grinding wheel must fit the limit surface obtained by the revolving of the helical surface of the rake face. The geometrical model is supported by numerical example, followed by CAD-simulation. The conclusion confirms that the actual technological system set as presented in this paper, and used as the same in many practical applications, is unable to realize a helical surface that fits the theoretical equations stated in the literature.