Share on FacebookShare on Google+Tweet about this on Twitter

At the top the M8 threaded rod is mounted using an axial ball bearing, so it just hangs down from it.
At the lower end it goes through a radial bearing that is mounted from the bottom. The pulley is mounted in a way that the whole screw is tightened slightly, that way it never bends but will always be straight.
I use an axial bearing at the top since the load is the weight of the X assembly plus the tension on the screw, while at the bottom i only use a radial bearing since it mostly has to cope with the pull of the belt and in axial direction only with the tension force.

Z-Axis-01 Z-Axis-05 Z-Axis-04 Z-Axis-03 Z-Axis-02