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Originally Posted by russell
Another way I think you could do it would be to put a latching relay between the two leads on the motor, and have it off until you want the motor to lock then switch it to the on position. That will at least slow it down.
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true but you have to beable to stop back drive after the power is shut off....i really think some of the mechanical soultions mentioned in this thread will help you out. i also was thinking of a wrap spring ( like inside your tape measure) around the shaft of your motor...since you know the total distance you will traven you can have it set to put pressure on in the forward direction of motor travel that way when if starts to backdrive the spring would be working in your favor.....
also if you use another mechanciacl method why don;t you activate it by a limit switch on your grabber that way when you are at the height you want it will automaticly trigger eliminating the back drive which would take place untill the trigger is activated