When machining components or moulds, it is sometimes necessary to remove holes or other apertures from surfaces to enable more efficient manufacture. NCG CAM has functionality which will enable the user to remove individual holes, even on doubly curved surfaces, or remove the complete inside trimming edges as shown right.

NCG CAM also has the ability to create internal fillets, this can in some instances allow a more flowing toolpath. Planar patches can also be create to cap or protect areas if needed. It is also possible to create a ruled surface between 2 curves to aid machining past the end of a surface.