The strategy depends on the feedback motion from the moving gantry which will be used to move both of the two wire tensiors (at the ends) front and back parallel to the threaded pulley axis.
This will be achieved by converting the linear motion of the gantry to a rotation motion via another separated wire rope and pulleys at both of the ends of the wire rope, and then converting the rotary motion to a linear motion for the wire tensioners which will be vertical to the gantry motion and parallel to the threaded pulley axis via a threaded rod by the same pitch of the the threaded pulley to ensure that the wire ends will be aligned with the pulley every where.
But I want to inform that I have tested the motion without feed back motion and found that the pulley threads were able to move the wire rope and the wire tensioners without the feedback system depending on the rolling bearings installed in the wire tensioners.
But even it is enough, I will use the feed back motion to ensure a smooth movement and prevent the horisontal stress component on the thread that will be used to move the wire tensioners.
pls see the attached photo that may clarify better.