A reference structured grid is de- fined on the tooth, then refinement criteria are applied in order to obtain accurate solutions in terms of tooth deflection, contact pressure and fillet stress. The minimum number of parameters needed to describe the profile in the presence of tip and root reliefs, helix modification and crowning is discussed. from a measured topography) is pro- posed. A new method for finding the enveloping profiles for a generic tool (e.g. Gear profiles are obtained by means of numerical simulation of the cutting pro- cess and an accurate description is provided in terms of NURBS curves or surfaces. A method for solving the contact problem for generic helical gear pairs (either external or inter- nal) is described.
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