System of the computer model in generating gear

Imitate the procedure of rack cutter generate gear blank by the language of Visual Basic 6.0,and modify the parameter such as module、number of teeth、 pressure angle、and coefficient of profile shift in the appropriate and limited range,then contrast the gear's difference with positive modified gear 、zero modified gear and negative modified gear. Successive generation imitate automatically the whole procedure of the rack cutter's generating the gear blank;Generating the gear teeth step by step is able to look through the procedure of the rack cuts the gear blank .