Quote:
Originally Posted by JellyMan
Since worm gear transmissions cannot be back-driven, and since the motors would be working together on the same axis, we are concerned that they may bind up.
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The idea that worm gears can't be backdriven is a bit of a misconception. It actually depends on the design of the system—some high-efficiency worm gears can definitely be backdriven. (See page G-57
here for more details.)
As Tytus explained, they can't be electrically in parallel, only mechanically. But in that configuration one failure in a motor or electrical component will probably lock up your arm, or worse.