The generate factor is a worm. In purchase to combine the wheel/worm into a worm gear, it must be ensured that the middle distance is equal and the transmission ratio is equal. Middle distances are offered from inventory in tiny methods in between 17mm and 80mm. Each centre length has a number of gear ratios. Ep worm gears are suited for the manufacturing of worm drives with a shaft angle of 90°. Making use of a worm travel, really big reduction ratios (up to 100:1) can be achieved.