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Why Worm gears are not reversible

Why Worm gears are not reversible

Worm gears are used in speed reducer  this drive has a worm(driving Shaft) and a worm wheel (driven wheel)
The speed reduction ratio is about 300:3 rpm

Why it is not reversible:

Worm gear has more contact area than any other gears so it has more friction so it has been used as self locking mechanism.
Due to this more friction worm gears are not reversible.
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