The pencil milling routine is to finish corners which might otherwise have cusp marks left from previous machining operations.
This is ideal for machining into corners where the surface radius is the same as the cutter corner radius. Single pass pencil milling gives a high surface finish ready for polishing. When machining, the toolpath maintains climb milling as default and can be used in conjunction with cutter contact angles. As with all toolpaths in NCG CAM they can be animated alone or with holders. See the pencil milling example to the left.