Posted by BillS on June 25, 2008 at 20:18:40:
In Reply to: self locking spur gear design posted by micheael on June 24, 2008 at 15:32:42:
Since you are designing rather than modifying, try an electric clutch on the input shaft that is spring loaded/locked when not powered, and releases when powered. Power the clutch along with the motor.
Seems like with such a high gear ratio, a viscous lubricant should practically "lock" the box when not running.