Side Clearance moves are commonly used for applying cutter compensation or to position the tool away from the contour to avoid leaving a dwell mark. Cutter compensation is often applied to adjust for the difference between the programmed tool diameter and the actual tool diameter.
Set Side Clearance ON to insert a linear move perpendicular to either the beginning of the first leadin move or the end of the last leadout move. If you set Lead Type to None, the side clearance move is perpendicular to the part contour.