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The travel factor is a worm. In purchase to blend the wheel/worm into a worm gear, it need to be ensured that the center length is equal and the transmission ratio is equivalent. Centre distances are obtainable from inventory in small measures among 17mm and 80mm. Each center length has a number of gear ratios. Ep worm gears are suited for the manufacturing of worm drives with a shaft angle of 90°. Employing a worm generate, quite big reduction ratios (up to one hundred:1) can be attained.
