the precise pitch with PC gear box

PC gear box ,Faced with the need to cut a worm gear I would suggest that the viewer calculates the precise pitch required and then refers to my pages that provide the results for all possible combinations of available gears based on gears having 20 to 75 teeth by fives plus 21 teeth and 38 teeth gears. The hypoid gearbox are two sets of lists, one for a lathe having an 8 TPI leadscrew, the other a 2mm pitch leadscrew.