Isoline milling uses the isoline curves of a surface to mill the surface. These curves can be in the row direction or column direction. This figure shows an example of isoline toolpaths on a single surface.
Advantages
Uniform finish with scallop height control. The toolpaths are spaced based on the distance along the surface.
Nearly-vertical walls handled well. Since this is not a projection technique, nearly vertical walls are cut correctly.
Disadvantages
Toolpaths generated on a surface by surface basis.