I tweaked my Haas backlash settings a tiny bit. Chances are good that there is already some minute backlash settings already in the factory setup, its not like the machines come out with no backlash, that would mean they are perfect
If you get a ballbar done, it would be interesting to see if the tech actually goes in and sets all the backlash settings to zero, to find out what the machine is really like
So in the X parameters screen, there is a setting for X backlash. A similar setting is available in the other axis. The actual amount of the adjustment would be in encoder counts. If you look farther up the screen, you might see something like "X Ratio steps/unit = 138718"
Do not change this!. Just look at it
This means that one encoder count is .0000072" or quite tiny. That means it would take approxiamately a 14 encoder count adjustment to remove .0001" of backlash. My machine now has a backlash setting of 64 in X.
If the error is gross, I'd be looking, as WMS stated, at other things in the system. Or, if the backlash amount changes again in a few days use, same thing.