Use a motor to rotate a nut on a fixed threaded rod?
I am creating a time-lapse dolly, and at the moment I am working on the drive system. One thought was to use a threaded rod+nut to propel the cart, and I want to look in to this method because it seems fairly versatile. So I would have a taught, fixed threaded rod running through the middle of my 8"x6'x1" track. The cart sits on top of that. I have the motor and the cart pictured below.
How can I get this motor to spin a group of nuts (attached to the cart) so that it propels the cart along the threaded rod?