Quote:
Originally Posted by ajlapp
This isn't an accurate statement. These drives can be back driven in some circumstances.
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Perhaps one of the gearboxes in which the teeth are actually roller bearings. With the simpler ones (pegs in holes), I don't see how the system could be back-driven; there's too much friction. [gut feeling]At ratios much over 100:1, you would probably have to intentionally design a gearbox for it to be back-drivable.[/gut feeling] Designing it to NOT be back-drivable gets easier as the ratio increases for any given architecture.