You measure the backlash and then go into config and implement it, here are some recomendations:
BACKLASH:
Here is what i would recommend for initial settings when using a machine with more than one axis.
"My" 50-50-50 rule of thumb.
Motor velocity setting: 50% of max velocity ( down from where you would start to miss steps post motor tuning )
Backlash Speed: 50%
Shuttle acceleration: .050 ( .5, or .050, or .0050 just an easly way to remember the setting )
Then you can play with individual settings to get the system just so, such that you have no problems
during a two axis move. The motor acceleration can also be payed with.
RICH