الفهرس 
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Abstract
Software was developed to generate gear tooth profile, distribute the sum of addendum modification coefficients probably on mating gears and to determine the different gears errors. Accordingly, a model was tested and proved its capability to:-
• generate automatically the profile for spur and helical gears with different modifications thus, acting as the virtual master gear. This eliminates the necessity to manufacture master gears.
• give adequate methods to distribute the sum of addendum modification coefficients according to the required design criteria.
• improve the gear performance through the optimal distribution of the addendum modifications.
• help the designer to see and check the shape of the generated gear profile before actually starting its manfacturing.
• bring the physical gear into computer domain so that error measurement can be carried out in the computer, thus, saving effort and time.
• work as computer aided gear measurement through determining the following errors:
• Tooth thickness error
• Individual pitch error
• Base pitch error
• Composite pitch error