TOMAPOWA, I have seen hollow shaft motors but not gear box's was hoping that you had. Have to look around the Robot guys just seems like something they would have. It is the only thing I have come up with for gear doors except for a double bell crank with a rod connecting both bell cranks at one end. The rod would be threaded in the middle and then the other ends of the bell cranks attached to the doors. Then have one of your motor setups with the jack screw threaded onto the rod, you could use nuts to limit travel. I have done something similar but with a air cylinder. Don't want your mind going idle.
