Good morning,

this is my first large assembly i have made, i have mated all the components together and now i cannot seem to get it to move!  when the ram in the middle moves the motor should open and close but the only part i can get to move is the top rail.  can someone explain where i have gone wrong? perhaps i should mention there are no sub-assemblies and also this was converted from a .step file (if that will make any difference?)

any help would be greatly appreciated.

many thanks