Minimum surface slope in direction of toolpath will limit toolpaths to the regions where the toolpath itself has a minimum steepness. It applies to Parallel toolpaths only. It works best when you create two parallel cuts in sequence where the second is 90 degrees off of the first one. For example, The figure below shows a four-sided surface after roughing in the X direction. It is badly cut on the front and back walls.
A second operation with a Y parallel limited by a Minimum surface slope in direction of toolpath of 45 degrees results in these toolpaths.
Note that the toolpaths are only where the paths are steep. The result of both operations are shown in this figure.
See also Maximum surface slope and Minimum surface slope .