Originally Posted by
109jb
This is because my ballnut setup uses springs to force the ballnuts apart resulting in absolutely no backlash. The spring force is about 100-150 pounds driving them apart. On most double nut setups the ballnuts have shims between them to provide as little backlash as possible without binding, but because of screw lead errors the shimming cannot eliminate the backlash without binding the screw at some locations, so this method usually still has a little bit of backlash. Not much, but still a bit..