The travel element is a worm. In buy to combine the wheel/worm into a worm gear, it must be ensured that the centre distance is equal and the transmission ratio is equivalent. Heart distances are obtainable from inventory in little measures between 17mm and 80mm. Each heart length has several equipment ratios. Ep worm gears are appropriate for the creation of worm drives with a shaft angle of 90°. Using a worm generate, extremely large reduction ratios (up to 100:1) can be attained.