The Gouge check dialog is displayed.
This tab contains all options to avoid the tool gouging selected drive and check surfaces.
For a description of the parameters, click on the relevant parameter in the dialog below (click on the tabs, on the top of the dialog, for additional parameters):

The gouge checking option looks at the generated toolpath and the end surfaces to decide whether the tool components are gauging the surfaces. Further check surfaces can be selected to avoid gouges with surfaces that are not going to be machined.
The gouge checking is supported for all tool types (flat, ball, conical and bull nose). The check is done at each calculated tool position.