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Originally Posted by Matt Adams
You need to be a little careful with worm gears, they CAN be back driven. The van door motor for instance can be back driven. Some sort of a ratcheting mechanism might be a better choice, since it's a firm mechanical stop.
2 cents...
Matt
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Perhaps I'm mistaken, but I was under the impression that a fundemental aspect of the worm gear was that it was impossible for it to be back driven. I've never seen the van door motors backdriven so it may be something else you've seen. Worm gears can break however as the stress of resisting back driving can be great.
Matt