Hi all,

First post here. I have a 3D printing background, and am building a 1500mm x 1500mm (usable 1200x1200) CNC. I've ordered some 1500mm x 16mm rolled ball screws. I'm testing just to ensure there's nothing out of the ordinary on them.

I've put the screws in the bearing blocks on my work bench and clamped them down so they don't walk. I'm noticing around 1-2mm deflection or run out I guess as the screw rotates at a very slow speed. As the speed increases, it finally gets to a point where it smooths out, but we're talking probably 300-400IPM. The nut is not attached to anything, it's just free floating, or I'm holding gently to keep it from just spinning and staying in place to watch it travel.

Is this normal on these until the ball nut has been attached to a carriage, or is this something I need to get warrantied out / returned?

Thanks!