How to interpret the self-locking mechanism of worm gearboxes

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In machinery, robots or mechanical installations the self-locking mechanism of a worm gearbox as a prevention of e.g. back driving can be the essential factor in the choice of gearbox, as it can seem as an opportunity to save the cost of a braking system or the like. Especially in applications that require lifting and/or holding loads the self-locking mechanism can be useful.